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// Copyright 2019 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// Private property symbols
// TODO(tkent): Use private fields.
const _value = Symbol();
const _trackElement = Symbol();
const _fillElement = Symbol();
const _slotElement = Symbol();
export class SwitchTrack {
/**
* @param {!Document} factory A factory for elements created for this track.
*/
constructor(factory) {
this[_value] = false;
this._initializeDOM(factory);
}
/**
* @return {!Element}
*/
get element() {
return this[_trackElement];
}
/**
* @param {Boolean} newValue
*/
set value(newValue) {
let oldValue = this[_value];
this[_value] = Boolean(newValue);
let bar = this[_fillElement];
if (bar) {
bar.style.inlineSize = this[_value] ? '100%' : '0%';
if (oldValue != this[_value]) {
this._addSlot();
}
}
}
// TODO(tkent): Use private fields. #initializeDOM = factory => { ...};
/**
* @param {!Document} factory A factory for elements created for this track.
*/
_initializeDOM(factory) {
this[_trackElement] = factory.createElement('div');
this[_trackElement].id = 'track';
this[_trackElement].part.add('track');
this[_fillElement] = factory.createElement('span');
this[_fillElement].id = 'trackFill';
this[_fillElement].part.add('track-fill');
this[_trackElement].appendChild(this[_fillElement]);
this[_slotElement] = factory.createElement('slot');
this._addSlot();
}
/**
* Add the <slot>
* - next to _fillElement if _value is true
* - as a child of _fillElement if _value is false
* This behavior is helpful to show text in the track.
*/
_addSlot() {
if (this[_value]) {
this[_fillElement].appendChild(this[_slotElement]);
} else {
this[_trackElement].appendChild(this[_slotElement]);
}
}
}
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