botframework-webchat-component/lib/hooks/internal/useRegisterScrollToEnd.js

React component of botframework-webchat

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.default = useRegisterScrollTo;

var _react = require("react");

var _removeInline = _interopRequireDefault(require("../../Utils/removeInline"));

var _useWebChatUIContext2 = _interopRequireDefault(require("./useWebChatUIContext"));

function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }

// This hook is for registering and unregister a callback, used by <BasicTranscript>.
// When called, the callback should scroll the transcript to the end.
function useRegisterScrollTo(callback) {
  var _useWebChatUIContext = (0, _useWebChatUIContext2.default)(),
      scrollToEndCallbacksRef = _useWebChatUIContext.scrollToEndCallbacksRef;

  (0, _react.useEffect)(function () {
    var scrollToEndCallbacks = scrollToEndCallbacksRef.current;
    scrollToEndCallbacks.push(callback);
    return function () {
      return (0, _removeInline.default)(scrollToEndCallbacks, callback);
    };
  }, [callback, scrollToEndCallbacksRef]);
}
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