package.src.vaadin-grid-tree-toggle-mixin.js Maven / Gradle / Ivy

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A free, flexible and high-quality Web Component for showing large amounts of tabular data
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/**
 * @license
 * Copyright (c) 2016 - 2023 Vaadin Ltd.
 * This program is available under Apache License Version 2.0, available at https://vaadin.com/license/
 */
import { css, registerStyles } from '@vaadin/vaadin-themable-mixin/vaadin-themable-mixin.js';
import { isFocusable } from './vaadin-grid-active-item-mixin.js';

const template = document.createElement('template');

template.innerHTML = `
  
`;

document.head.appendChild(template.content);

registerStyles(
  'vaadin-grid-tree-toggle',
  css`
    :host {
      display: inline-flex;
      align-items: baseline;
      max-width: 100%;

      /* CSS API for :host */
      --vaadin-grid-tree-toggle-level-offset: 1em;
      --_collapsed-icon: '\\e7be\\00a0';
    }

    :host([dir='rtl']) {
      --_collapsed-icon: '\\e7bd\\00a0';
    }

    :host([hidden]) {
      display: none !important;
    }

    :host(:not([leaf])) {
      cursor: pointer;
    }

    #level-spacer,
    [part='toggle'] {
      flex: none;
    }

    #level-spacer {
      display: inline-block;
      width: calc(var(---level, '0') * var(--vaadin-grid-tree-toggle-level-offset));
    }

    [part='toggle']::before {
      font-family: 'vaadin-grid-tree-icons';
      line-height: 1em; /* make icon font metrics not affect baseline */
    }

    :host(:not([expanded])) [part='toggle']::before {
      content: var(--_collapsed-icon);
    }

    :host([expanded]) [part='toggle']::before {
      content: '\\e7bc\\00a0'; /* icon glyph + single non-breaking space */
    }

    :host([leaf]) [part='toggle'] {
      visibility: hidden;
    }

    slot {
      display: block;
      overflow: hidden;
      text-overflow: ellipsis;
    }
  `,
  { moduleId: 'vaadin-grid-tree-toggle-styles' },
);

/**
 * @polymerMixin
 */
export const GridTreeToggleMixin = (superClass) =>
  class extends superClass {
    static get properties() {
      return {
        /**
         * Current level of the tree represented with a horizontal offset
         * of the toggle button.
         * @type {number}
         */
        level: {
          type: Number,
          value: 0,
          observer: '_levelChanged',
          sync: true,
        },

        /**
         * Hides the toggle icon and disables toggling a tree sublevel.
         * @type {boolean}
         */
        leaf: {
          type: Boolean,
          value: false,
          reflectToAttribute: true,
        },

        /**
         * Sublevel toggle state.
         * @type {boolean}
         */
        expanded: {
          type: Boolean,
          value: false,
          reflectToAttribute: true,
          notify: true,
          sync: true,
        },
      };
    }

    constructor() {
      super();
      this.addEventListener('click', (e) => this._onClick(e));
    }

    /** @private */
    _onClick(e) {
      if (this.leaf) {
        return;
      }
      if (isFocusable(e.target) || e.target instanceof HTMLLabelElement) {
        return;
      }

      e.preventDefault();
      this.expanded = !this.expanded;
    }

    /** @private */
    _levelChanged(level) {
      const value = Number(level).toString();
      this.style.setProperty('---level', value);
    }
  };