Source: jsdoc/node_modules/elements-sk/tabs-sk/tabs-sk.js

// Copyright 2018 Google LLC
//
// 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
//
//     https://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.
/**
 * @module elements-sk/tabs-sk
 * @description <h2><code>tabs-sk</code></h2>
 *
 * <p>
 * The tabs-sk custom element declaration, used in conjunction with button and
 * the [tabs-panel-sk]{@link module:elements-sk/tabs-panel-sk} element
 * allows you to create tabbed interfaces. The association between the buttons
 * and the tabs displayed in [tabs-panel-sk]{@link module:elements-sk/tabs-panel-sk}
 * is document order, i.e. the first button shows the first panel, second
 * button shows second panel, etc.
 * </p>
 *
 * @example
 *
 * <tabs-sk>
 *   <button class=selected>Query</button>
 *   <button>Results</button>
 * </tabs-sk>
 * <tabs-panel-sk>
 *   <div>
 *     This is the query tab.
 *   </div>
 *   <div>
 *     This is the results tab.
 *   </div>
 * </tabs-panel-sk>
 *
 * @attr selected - The index of the selected tab.
 *
 * @evt tab-selected-sk - Event sent when the user clicks on a tab. The events
 *        value of detail.index is the index of the selected tab.
 *
 */
import { define } from '../define';
export class TabsSk extends HTMLElement {
    static get observedAttributes() {
        return ['selected'];
    }
    connectedCallback() {
        this.addEventListener('click', this);
        this.select(0, false);
    }
    disconnectedCallback() {
        this.removeEventListener('click', this);
    }
    handleEvent(e) {
        e.stopPropagation();
        this.querySelectorAll('button').forEach((ele, i) => {
            if (ele === e.target) {
                this.select(i, true);
            }
        });
    }
    /** Reflects the 'selected' attribute.  */
    get selected() { return +(this.getAttribute('selected') || ''); }
    set selected(val) { this.setAttribute('selected', String(val)); }
    /**
     * Force the selection of a tab
     *
     * @param index The index of the tab to select.
     * @param trigger If true then trigger the 'tab-selected-sk' event.
     */
    select(index, trigger = false) {
        this.selected = index;
        this.querySelectorAll('button').forEach((ele, i) => {
            ele.classList.toggle('selected', i === index);
        });
        this._trigger(index, trigger);
    }
    _trigger(index, trigger) {
        var _a;
        if (trigger) {
            this.dispatchEvent(new CustomEvent('tab-selected-sk', { bubbles: true, detail: { index: index } }));
        }
        if (((_a = this.nextElementSibling) === null || _a === void 0 ? void 0 : _a.tagName) === 'TABS-PANEL-SK') {
            this.nextElementSibling.setAttribute('selected', String(index));
        }
    }
    attributeChangedCallback(name, oldValue, newValue) {
        if (oldValue == newValue) {
            return;
        }
        this.select(+newValue, false);
    }
}
;
define('tabs-sk', TabsSk);
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