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

React component of botframework-webchat

"use strict";

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

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 in a relative motion, for example, page up and down.
function useRegisterScrollRelative(callback) {
  var _useWebChatUIContext = (0, _useWebChatUIContext2.default)(),
      scrollRelativeCallbacksRef = _useWebChatUIContext.scrollRelativeCallbacksRef;

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