gethue/ko/bindings/ko.delayedOverflow.js

Hue is an Open source SQL Query Editor for Databases/Warehouses

// Licensed to Cloudera, Inc. under one
// or more contributor license agreements.  See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership.  Cloudera, Inc. licenses this file
// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
// with the License.  You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

import $ from 'jquery';
import * as ko from 'knockout';

ko.bindingHandlers.delayedOverflow = {
  init: function (element, valueAccessor) {
    const $element = $(element);

    $element.css('overflow', 'hidden');

    let isTouch = false;
    $element.on('touchstart', () => {
      isTouch = true;
    });

    let scrollTimeout = -1;
    $element.hover(
      () => {
        scrollTimeout = window.setTimeout(
          () => {
            $element.css('overflow', 'auto');
          },
          valueAccessor && valueAccessor() === 'slow' ? 500 : 30
        );
      },
      () => {
        if (!isTouch) {
          clearTimeout(scrollTimeout);
          $element.css('overflow', 'hidden');
        }
      }
    );
  }
};