chrome-devtools-frontend/front_end/panels/elements/StylePropertyHighlighter.ts

Chrome DevTools UI

// Copyright (c) 2015 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

import type * as SDK from '../../core/sdk/sdk.js';

import type {StylePropertiesSection} from './StylePropertiesSection.js';
import {StylePropertyTreeElement} from './StylePropertyTreeElement.js';
import type {StylesSidebarPane} from './StylesSidebarPane.js';

export class StylePropertyHighlighter {
  private readonly styleSidebarPane: StylesSidebarPane;
  constructor(ssp: StylesSidebarPane) {
    this.styleSidebarPane = ssp;
  }

  /**
   * Expand all shorthands, find the given property, scroll to it and highlight it.
   */
  highlightProperty(cssProperty: SDK.CSSProperty.CSSProperty): void {
    // Expand all shorthands.
    for (const section of this.styleSidebarPane.allSections()) {
      for (let treeElement = section.propertiesTreeOutline.firstChild(); treeElement;
           treeElement = treeElement.nextSibling) {
        void treeElement.onpopulate();
      }
    }

    const {treeElement, section} = this.findTreeElementAndSection(treeElement => treeElement.property === cssProperty);
    if (treeElement) {
      treeElement.parent && treeElement.parent.expand();
      this.scrollAndHighlightTreeElement(treeElement);
      if (section) {
        section.element.focus();
      }
    }
  }

  /**
   * Find the first non-overridden property that matches the provided name, scroll to it and highlight it.
   */
  findAndHighlightPropertyName(propertyName: string): void {
    for (const section of this.styleSidebarPane.allSections()) {
      if (!section.style().hasActiveProperty(propertyName)) {
        continue;
      }
      section.showAllItems();
      const treeElement = this.findTreeElementFromSection(
          treeElement => treeElement.property.name === propertyName && !treeElement.overloaded(), section);
      if (treeElement) {
        this.scrollAndHighlightTreeElement(treeElement);
        if (section) {
          section.element.focus();
        }
        return;
      }
    }
  }

  /**
   * Traverse the styles pane tree, execute the provided callback for every tree element found, and
   * return the first tree element and corresponding section for which the callback returns a truthy value.
   */
  private findTreeElementAndSection(compareCb: (arg0: StylePropertyTreeElement) => boolean): {
    treeElement: StylePropertyTreeElement|null,
    section: StylePropertiesSection|null,
  } {
    for (const section of this.styleSidebarPane.allSections()) {
      const treeElement = this.findTreeElementFromSection(compareCb, section);
      if (treeElement) {
        return {treeElement, section};
      }
    }
    return {treeElement: null, section: null};
  }

  private findTreeElementFromSection(
      compareCb: (arg0: StylePropertyTreeElement) => boolean, section: StylePropertiesSection): StylePropertyTreeElement
      |null {
    let treeElement = section.propertiesTreeOutline.firstChild();
    while (treeElement && (treeElement instanceof StylePropertyTreeElement)) {
      if (compareCb(treeElement)) {
        return treeElement;
      }
      treeElement = treeElement.traverseNextTreeElement(false, null, true);
    }
    return null;
  }

  private scrollAndHighlightTreeElement(treeElement: StylePropertyTreeElement): void {
    treeElement.listItemElement.scrollIntoViewIfNeeded();
    treeElement.listItemElement.animate(
        [
          {offset: 0, backgroundColor: 'rgba(255, 255, 0, 0.2)'},
          {offset: 0.1, backgroundColor: 'rgba(255, 255, 0, 0.7)'},
          {offset: 1, backgroundColor: 'transparent'},
        ],
        {duration: 2000, easing: 'cubic-bezier(0, 0, 0.2, 1)'});
  }
}