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Filename : useInputKeyDownHandler.js
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import { useCallback } from 'react';

// Returns a custom `onKeyDown` handler that works around a Backspace keypress edge case:
// * `<PhoneInputWithCountrySelect international countryCallingCodeEditable={false}/>`
// * When placing the caret before the leading plus character and pressing Backspace,
//   it duplicates the country calling code in the `<input/>`.
// https://github.com/catamphetamine/react-phone-number-input/issues/442
export default function useInputKeyDownHandler(_ref) {
  var onKeyDown = _ref.onKeyDown,
    inputFormat = _ref.inputFormat;
  return useCallback(function (event) {
    // Usability:
    // Don't allow the user to erase a leading "+" character when "international" input mode is forced.
    // That indicates to the user that they can't possibly enter the phone number in a non-international format.
    if (event.keyCode === BACKSPACE_KEY_CODE && inputFormat === 'INTERNATIONAL') {
      // It checks `event.target` here for being an `<input/>` element
      // because "keydown" events may bubble from arbitrary child elements
      // so there's no guarantee that `event.target` represents an `<input/>` element.
      // Also, since `inputComponent` is not neceesarily an `<input/>`, this check is required too.
      if (event.target instanceof HTMLInputElement) {
        if (getCaretPosition(event.target) === LEADING_PLUS.length) {
          event.preventDefault();
          return;
        }
      }
    }
    if (onKeyDown) {
      onKeyDown(event);
    }
  }, [onKeyDown, inputFormat]);
}

// Gets the caret position in an `<input/>` field.
// The caret position starts with `0` which means "before the first character".
function getCaretPosition(element) {
  return element.selectionStart;
}
var BACKSPACE_KEY_CODE = 8;
var LEADING_PLUS = '+';
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