62 lines
2.1 KiB
JavaScript
62 lines
2.1 KiB
JavaScript
/*global define*/
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define(
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[],
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function () {
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'use strict';
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/**
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* Implements `mct-scroll-x` and `mct-scroll-y` directives. Listens
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* for scroll events and publishes their results into scope; watches
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* scope and updates scroll state to match. This varies for x- and y-
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* directives only by the attribute name chosen to find the expression,
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* and the property (scrollLeft or scrollTop) managed within the
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* element.
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*
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* This is exposed as two directives in `bundle.json`; the difference
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* is handled purely by parameterization.
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*
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* @constructor
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* @param $parse Angular's $parse
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* @param {string} property property to manage within the HTML element
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* @param {string} attribute attribute to look at for the assignable
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* Angular expression
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*/
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function MCTScroll($parse, property, attribute) {
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function link(scope, element, attrs) {
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var expr = attrs[attribute],
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parsed = $parse(expr);
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// Set the element's scroll to match the scope's state
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function updateElement(value) {
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element[0][property] = value;
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}
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// Handle event; assign to scroll state to scope
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function updateScope() {
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parsed.assign(scope, element[0][property]);
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scope.$apply(expr);
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}
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// Initialize state in scope
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parsed.assign(scope, element[0][property]);
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// Update element state when value in scope changes
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scope.$watch(expr, updateElement);
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// Update state in scope when element is scrolled
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element.on('scroll', updateScope);
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}
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return {
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// Restrict to attributes
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restrict: "A",
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// Use this link function
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link: link
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};
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}
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return MCTScroll;
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}
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); |