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/*****************************************************************************
* Open MCT, Copyright (c) 2014-2021, United States Government
* as represented by the Administrator of the National Aeronautics and Space
* Administration. All rights reserved.
*
* Open MCT is licensed 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.
*
* Open MCT includes source code licensed under additional open source
* licenses. See the Open Source Licenses file (LICENSES.md) included with
* this source code distribution or the Licensing information page available
* at runtime from the About dialog for additional information.
*****************************************************************************/
define(
[],
function () {
/**
* Implements `mct-scroll-x` and `mct-scroll-y` directives. Listens
* for scroll events and publishes their results into scope; watches
* scope and updates scroll state to match. This varies for x- and y-
* directives only by the attribute name chosen to find the expression,
* and the property (scrollLeft or scrollTop) managed within the
* element.
*
* This is exposed as two directives in `bundle.json`; the difference
* is handled purely by parameterization.
*
* @memberof platform/commonUI/general
* @constructor
* @param $parse Angular's $parse
* @param {string} property property to manage within the HTML element
* @param {string} attribute attribute to look at for the assignable
* Angular expression
*/
function MCTScroll($parse, property, attribute) {
function link(scope, element, attrs) {
var expr = attrs[attribute],
parsed = $parse(expr);
// Set the element's scroll to match the scope's state
function updateElement(value) {
element[0][property] = value;
}
// Handle event; assign to scroll state to scope
function updateScope() {
parsed.assign(scope, element[0][property]);
scope.$apply(expr);
}
// Initialize state in scope
parsed.assign(scope, element[0][property]);
// Update element state when value in scope changes
scope.$watch(expr, updateElement);
// Update state in scope when element is scrolled
element.on('scroll', updateScope);
}
return {
// Restrict to attributes
restrict: "A",
// Use this link function
link: link
};
}
return MCTScroll;
}
);
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