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// Copyright 2017 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
import {assert} from 'chrome://resources/js/assert.js';
import {CustomElement} from 'chrome://resources/js/custom_element.js';
import {getTemplate} from './expandable_list.html.js';
export class ExpandableListElement extends CustomElement {
static get template() {
return getTemplate();
}
connectedCallback() {
this.classList.add('expandable-list');
}
/**
* Sets the data model of the list.
* @param {Array} data
*/
setData(data) {
this.updateMessageDisplay_(data.length === 0);
const items = this.shadowRoot.querySelector('.list-items');
data.forEach(item => {
const listItem = this.createItem(item);
items.appendChild(listItem);
});
}
createItem(itemData) {}
/**
* Sets the empty message text.
* @param {string} message
*/
setEmptyMessage(message) {
const emptyMessage = this.shadowRoot.querySelector('.empty-message');
emptyMessage.textContent = message;
}
/**
* Sets the spinner display state. If |showing| is true, the loading
* spinner is dispayed.
* @param {boolean} showing
*/
setSpinnerShowing(showing) {
this.shadowRoot.querySelector('.spinner').hidden = !showing;
}
/**
* Gets the spinner display state. Returns true if the spinner is showing.
* @return {boolean}
*/
isSpinnerShowing() {
return !this.shadowRoot.querySelector('.spinner').hidden;
}
/**
* Updates the display state of the empty message. If there are no items in
* the data model, the empty message is displayed.
* @param {boolean} empty Whether the list is empty.
*/
updateMessageDisplay_(empty) {
const emptyMessage = this.shadowRoot.querySelector('.empty-message');
assert(emptyMessage);
emptyMessage.hidden = !empty;
}
}
customElements.define('expandable-list', ExpandableListElement);
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