dees-appui-catalog/ts_web/elements/dees-appui-maincontent.ts

import * as interfaces from './interfaces/index.js';

import {
  DeesElement,
  type TemplateResult,
  property,
  customElement,
  html,
  css,
  cssManager,
} from '@design.estate/dees-element';

import * as domtools from '@design.estate/dees-domtools';

@customElement('dees-appui-maincontent')
export class DeesAppuiMaincontent extends DeesElement {
  public static demo = () => html`<dees-appui-maincontent></dees-appui-maincontent>`;

  // INSTANCE
  @property({
    type: Array,
  })
  public tabs: interfaces.ITab[] = [
    { key: 'option 1', action: () => {} },
    { key: 'a very long option', action: () => {} },
    { key: 'reminder: set your tabs', action: () => {} },
    { key: 'option 4', action: () => {} },
  ];

  @property()
  public selectedTab = null;

  public static styles = [
    cssManager.defaultStyles,
    css`
      :host {
        color: #fff;
        display: block;
        width: 100%;
        height: 100%;
        position: relative;
        background: #161616;
      }
      .maincontainer {
        position: absolute;
        height: 100%;
        right: 0px;
        top: 0px;
        width: 100%;
      }

      .topbar {
        position: absolute;
        width: 100%;
        background: #000000;
        user-select: none;
      }

      .topbar .tabsContainer {
        padding-top: 20px;
        padding-bottom: 0px;
        position: relative;
        z-index: 1;
        display: grid;
        margin-left: 24px;
        font-size: 14px;
      }

      .topbar .tabsContainer .tab {
        color: #a0a0a0;
        white-space: nowrap;
        margin-right: 30px;
        padding-top: 4px;
        padding-bottom: 12px;
        transition: color 0.1s;
      }

      .topbar .tabsContainer .tab:hover {
        color: #ffffff;
      }

      .topbar .tabsContainer .tab.selectedTab {
        color: #e0e0e0;
      }

      .topbar .tabIndicator {
        position: absolute;
        z-index: 0;
        left: 40px;
        bottom: 0px;
        height: 40px;
        width: 40px;
        background: #161616;
        transition: all 0.1s;
        border-top-left-radius: 8px;
        border-top-right-radius: 8px;
        border-top: 1px solid #444444;
      }

      .mainicon {
      }
    `,
  ];

  public render(): TemplateResult {
    return html`
      <style>
        .topbar .tabsContainer {
          grid-template-columns: repeat(${this.tabs.length}, min-content);
        }
      </style>
      <div class="maincontainer">
        <div class="topbar">
          <div class="tabsContainer">
            ${this.tabs.map((tabArg) => {
              return html`
                <div
                  class="tab ${tabArg === this.selectedTab ? 'selectedTab' : null}"
                  @click="${() => {
                    this.selectedTab = tabArg;
                    this.updateTabIndicator();
                    tabArg.action();
                  }}"
                >
                  ${tabArg.key}
                </div>
              `;
            })}
          </div>
          <div class="tabIndicator"></div>
        </div>
      </div>
    `;
  }

  /**
   * updates the indicator
   */
  private updateTabIndicator() {
    let selectedTab = this.selectedTab;
    const tabIndex = this.tabs.indexOf(selectedTab);
    const selectedTabElement: HTMLElement = this.shadowRoot.querySelector(
      `.tabsContainer .tab:nth-child(${tabIndex + 1})`
    );
    const tabsContainer: HTMLElement = this.shadowRoot.querySelector('.tabsContainer');
    const marginLeft = parseInt(window.getComputedStyle(tabsContainer).getPropertyValue("margin-left"));
    const tabIndicator: HTMLElement = this.shadowRoot.querySelector('.tabIndicator');
    tabIndicator.style.width = selectedTabElement.clientWidth + 24 + 'px';
    tabIndicator.style.left = selectedTabElement.offsetLeft + marginLeft - 12 + 'px';
  }

  private updateTab(tabArg: interfaces.ITab) {
    this.selectedTab = tabArg;
    this.updateTabIndicator();
    this.selectedTab.action();
  }

  firstUpdated() {
    this.updateTab(this.tabs[0]);
  }
}