Ghost/ghost/admin/app/utils/bound-one-way.js

30 lines
825 B
JavaScript

import computed from 'ember-computed';
/**
* Defines a property similarly to `Ember.computed.oneway`,
* save that while a `oneway` loses its binding upon being set,
* the `BoundOneWay` will continue to listen for upstream changes.
*
* This is an ideal tool for working with values inside of {{input}}
* elements.
* @param {*} upstream
* @param {function} transform a function to transform the **upstream** value.
*/
export default function (upstream, transform) {
if (typeof transform !== 'function') {
// default to the identity function
transform = function (value) {
return value;
};
}
return computed(upstream, {
get() {
return transform(this.get(upstream));
},
set(key, value) {
return value;
}
});
}