grapesjs/src/style_manager/view/LayerView.js

import { View } from '../../common';
import { keys } from 'underscore';

export default class LayerView extends View {
  events() {
    return {
      click: 'select',
      'click [data-close-layer]': 'removeItem',
      'mousedown [data-move-layer]': 'initSorter',
      'touchstart [data-move-layer]': 'initSorter',
    };
  }

  template() {
    const { pfx, ppfx, em } = this;
    const icons = em?.getConfig().icons;
    const iconClose = icons?.close || '';
    const iconMove = icons?.move || '';

    return `
      <div class="${pfx}label-wrp">
        <div id="${pfx}move" class="${ppfx}no-touch-actions" data-move-layer>
          ${iconMove}
        </div>
        <div id="${pfx}label" data-label></div>
        <div id="${pfx}preview-box" class="${pfx}layer-preview" style="display: none" data-preview-box>
          <div id="${pfx}preview" class="${pfx}layer-preview-cnt" data-preview></div>
        </div>
        <div id="${pfx}close-layer" class="${pfx}btn-close" data-close-layer>
          ${iconClose}
        </div>
      </div>
      <div id="${pfx}inputs" data-properties></div>
    `;
  }

  initialize(o = {}) {
    const { model } = this;
    const config = o.config || {};
    this.em = config.em;
    this.config = config;
    this.sorter = o.sorter;
    this.pfx = config.stylePrefix || '';
    this.ppfx = config.pStylePrefix || '';
    this.propertyView = o.propertyView;
    const pModel = this.propertyView.model;
    this.listenTo(model, 'destroy remove', this.remove);
    this.listenTo(model, 'change:values', this.updateLabel);
    this.listenTo(pModel, 'change:selectedLayer', this.updateVisibility);

    // For the sorter
    model.view = this;
    model.set({ droppable: 0, draggable: 1 });
    this.$el.data('model', model);
  }

  initSorter() {
    this.sorter?.startSort(this.el);
  }

  removeItem(ev) {
    ev && ev.stopPropagation();
    this.model.remove();
  }

  select() {
    this.model.select();
  }

  getPropertiesWrapper() {
    if (!this.propsWrapEl) this.propsWrapEl = this.el.querySelector('[data-properties]');
    return this.propsWrapEl;
  }

  getPreviewEl() {
    if (!this.previewEl) this.previewEl = this.el.querySelector('[data-preview]');
    return this.previewEl;
  }

  getLabelEl() {
    if (!this.labelEl) this.labelEl = this.el.querySelector('[data-label]');
    return this.labelEl;
  }

  updateLabel() {
    const { model } = this;
    const label = model.getLabel();
    this.getLabelEl().innerHTML = label;

    if (model.hasPreview()) {
      const prvEl = this.getPreviewEl();
      const style = model.getStylePreview({ number: { min: -3, max: 3 } });
      const styleStr = keys(style)
        .map(k => `${k}:${style[k]}`)
        .join(';');
      prvEl.setAttribute('style', styleStr);
    }
  }

  updateVisibility() {
    const { pfx, model, propertyView } = this;
    const wrapEl = this.getPropertiesWrapper();
    const isSelected = model.isSelected();
    wrapEl.style.display = isSelected ? '' : 'none';
    this.$el[isSelected ? 'addClass' : 'removeClass'](`${pfx}active`);
    isSelected && wrapEl.appendChild(propertyView.props.el);
  }

  render() {
    const { el, pfx, model } = this;
    el.innerHTML = this.template();
    el.className = `${pfx}layer`;
    if (model.hasPreview()) {
      el.querySelector('[data-preview-box]').style.display = '';
    }
    this.updateLabel();
    this.updateVisibility();
    return this;
  }
}