Class default

Base element of the application tools icon.

Example:

   import {html, css} from 'lit';
   import {customElement} from 'lit/decorators.js';

   // @ts-ignore
   @customElement('my-button')
   export class MyToolButtonElement extends (window as any).gmfapi.elements.ToolButtonElement {
     constructor() {
       super(panelName);
     }

     render(): TemplateResult {
       return html`
         <button
           @click=${() => this.click_()}
           class="btn btn-default ${this.active_ ? 'active' : ''}"
           data-toggle="tooltip"
           data-placement="left"
           data-original-title="${i18next.t('Title')}"
         >
           <span class="fa fa-my-icon"></span>
         </button>
       `;
     }
   }