chrome-devtools-frontend/front_end/ui/components/docs/tree_outline/custom-renderers.ts

Chrome DevTools UI

// Copyright 2020 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

import * as FrontendHelpers from '../../../../testing/EnvironmentHelpers.js';
import * as Lit from '../../../lit/lit.js';
import * as ComponentHelpers from '../../helpers/helpers.js';
import * as TreeOutline from '../../tree_outline/tree_outline.js';

const {html} = Lit;

await ComponentHelpers.ComponentServerSetup.setup();
await FrontendHelpers.initializeGlobalVars();

interface TreeNodeData {
  cssProperty: string;
  cssValue: string;
}

const data: TreeOutline.TreeOutline.TreeOutlineData<TreeNodeData> = {
  defaultRenderer: (node, state) => {
    const {cssProperty, cssValue} = node.treeNodeData;
    const valueStyles = Lit.Directives.styleMap({
      paddingLeft: '10px',
      fontStyle: 'italic',
      color: 'var(--sys-color-token-property-special)',
    });
    return html`<code>${cssProperty}</code>:${
        state.isExpanded ? Lit.nothing : html`<code style=${valueStyles}>${cssValue}</code>`}`;
  },
  tree: [
    {
      treeNodeData: {cssProperty: 'border', cssValue: '1px solid red'},
      id: '1',
    },
    {
      treeNodeData: {cssProperty: 'font-size', cssValue: '20px'},
      id: '2',
    },
    {
      treeNodeData: {cssProperty: 'margin', cssValue: '10px 5px'},
      id: '3',
      async children(): Promise<Array<TreeOutline.TreeOutlineUtils.TreeNode<TreeNodeData>>> {
        return [
          {treeNodeData: {cssProperty: 'margin-left', cssValue: '5px'}, id: '4'},
          {treeNodeData: {cssProperty: 'margin-right', cssValue: '5px'}, id: '5'},
          {treeNodeData: {cssProperty: 'margin-top', cssValue: '10px'}, id: '6'},
          {treeNodeData: {cssProperty: 'margin-bottom', cssValue: '10px'}, id: '7'},
        ];
      },
    },
  ],
};

const component = new TreeOutline.TreeOutline.TreeOutline<TreeNodeData>();
component.data = data;

document.getElementById('container')?.appendChild(component);
document.getElementById('recursively-expand')?.addEventListener('click', () => {
  void component.expandRecursively();
});