reactstrap/src/utils.js at v3 · devonjs/reactstrap · GitHub

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export function getTetherAttachments(placement) {
  let attachments = {};
  switch (placement) {
    case 'top':
    case 'top center':
      attachments = {
        attachment: 'bottom center',
        targetAttachment: 'top center'
      };
      break;
    case 'bottom':
    case 'bottom center':
      attachments = {
        attachment: 'top center',
        targetAttachment: 'bottom center'
      };
      break;
    case 'left':
    case 'left center':
      attachments = {
        attachment: 'middle right',
        targetAttachment: 'middle left'
      };
      break;
    case 'right':
    case 'right center':
      attachments = {
        attachment: 'middle left',
        targetAttachment: 'middle right'
      };
      break;
    case 'top left':
      attachments = {
        attachment: 'bottom left',
        targetAttachment: 'top left'
      };
      break;
    case 'top right':
      attachments = {
        attachment: 'bottom right',
        targetAttachment: 'top right'
      };
      break;
    case 'bottom left':
      attachments = {
        attachment: 'top left',
        targetAttachment: 'bottom left'
      };
      break;
    case 'bottom right':
      attachments = {
        attachment: 'top right',
        targetAttachment: 'bottom right'
      };
      break;
    case 'right top':
      attachments = {
        attachment: 'top left',
        targetAttachment: 'top right'
      };
      break;
    case 'right bottom':
      attachments = {
        attachment: 'bottom left',
        targetAttachment: 'bottom right'
      };
      break;
    case 'left top':
      attachments = {
        attachment: 'top right',
        targetAttachment: 'top left'
      };
      break;
    case 'left bottom':
      attachments = {
        attachment: 'bottom right',
        targetAttachment: 'bottom left'
      };
      break;
    default:
      attachments = {
        attachment: 'top center',
        targetAttachment: 'bottom center'
      };
  }

  return attachments;
}

export const tetherAttachements = [
  'top',
  'bottom',
  'left',
  'right',
  'top left',
  'top center',
  'top right',
  'right top',
  'right middle',
  'right bottom',
  'bottom right',
  'bottom center',
  'bottom left',
  'left top',
  'left middle',
  'left bottom'
];

// https://github.com/twbs/bootstrap/blob/v4.0.0-alpha.4/js/src/modal.js#L436-L443
export function getScrollbarWidth() {
  let scrollDiv = document.createElement('div');
  // .modal-scrollbar-measure styles // https://github.com/twbs/bootstrap/blob/v4.0.0-alpha.4/scss/_modal.scss#L106-L113
  scrollDiv.style.position = 'absolute';
  scrollDiv.style.top = '-9999px';
  scrollDiv.style.width = '50px';
  scrollDiv.style.height = '50px';
  scrollDiv.style.overflow = 'scroll';
  document.body.appendChild(scrollDiv);
  const scrollbarWidth = scrollDiv.offsetWidth - scrollDiv.clientWidth;
  document.body.removeChild(scrollDiv);
  return scrollbarWidth;
}

export function setScrollbarWidth(padding) {
  document.body.style.paddingRight = padding > 0 ? `${padding}px` : null;
}

export function isBodyOverflowing() {
  return document.body.clientWidth < window.innerWidth;
}

export function getOriginalBodyPadding() {
  return parseInt(
    window.getComputedStyle(document.body, null).getPropertyValue('padding-right') || 0,
    10
  );
}

export function conditionallyUpdateScrollbar() {
  const scrollbarWidth = getScrollbarWidth();
  // https://github.com/twbs/bootstrap/blob/v4.0.0-alpha.4/js/src/modal.js#L420
  const fixedContent = document.querySelectorAll('.navbar-fixed-top, .navbar-fixed-bottom, .is-fixed')[0];
  const bodyPadding = fixedContent ? parseInt(
    fixedContent.style.paddingRight || 0,
    10
  ) : 0;

  if (isBodyOverflowing()) {
    setScrollbarWidth(bodyPadding + scrollbarWidth);
  }
}

export function mapToCssModules(className, cssModule) {
  if (!cssModule) return className;
  return className.split(' ').map(c => cssModule[c] || c).join(' ');
}