@ionic/core/dist/collection/utils/input-shims/hacks/scroll-padding.js

Base components for Ionic

const PADDING_TIMER_KEY = '$ionPaddingTimer';
export const enableScrollPadding = (keyboardHeight) => {
  const doc = document;
  const onFocusin = (ev) => {
    setScrollPadding(ev.target, keyboardHeight);
  };
  const onFocusout = (ev) => {
    setScrollPadding(ev.target, 0);
  };
  doc.addEventListener('focusin', onFocusin);
  doc.addEventListener('focusout', onFocusout);
  return () => {
    doc.removeEventListener('focusin', onFocusin);
    doc.removeEventListener('focusout', onFocusout);
  };
};
const setScrollPadding = (input, keyboardHeight) => {
  if (input.tagName !== 'INPUT') {
    return;
  }
  if (input.parentElement && input.parentElement.tagName === 'ION-INPUT') {
    return;
  }
  if (input.parentElement &&
    input.parentElement.parentElement &&
    input.parentElement.parentElement.tagName === 'ION-SEARCHBAR') {
    return;
  }
  const el = input.closest('ion-content');
  if (el === null) {
    return;
  }
  const timer = el[PADDING_TIMER_KEY];
  if (timer) {
    clearTimeout(timer);
  }
  if (keyboardHeight > 0) {
    el.style.setProperty('--keyboard-offset', `${keyboardHeight}px`);
  }
  else {
    el[PADDING_TIMER_KEY] = setTimeout(() => {
      el.style.setProperty('--keyboard-offset', '0px');
    }, 120);
  }
};