react-native-devtools-frontend/front_end/quick_open/QuickPick.js

// Copyright 2020 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 * as Diff from '../diff/diff.js';
import * as UI from '../ui/ui.js';  // eslint-disable-line no-unused-vars
import {FilteredListWidget, Provider} from './FilteredListWidget.js';

/**
 * @typedef {{
 *  label: string,
 *  description: (string|undefined),
 *  detail: (string|undefined),
 * }}
 */
// @ts-ignore
export let QuickPickItem;

/**
 * @typedef {{
 *   placeHolder: string,
 *   matchOnDescription: (boolean|undefined),
 *   matchOnDetail: (boolean|undefined),
 * }}
 */
// @ts-ignore
export let QuickPickOptions;

export class QuickPick {
  /**
   * @private
   */
  constructor() {
    throw new ReferenceError('Instance type not implemented.');
  }

  /**
   *
   * @param {!Array<!QuickPickItem>} items
   * @param {!QuickPickOptions} options
   * @return {!Promise<!QuickPickItem|undefined>}
   */
  static show(items, options) {
    /**
     * @type {!Promise<undefined>}
     */
    let canceledPromise = new Promise(_r => {});  // Intentionally creates an unresolved promise
    /**
     * @type {!Promise<!QuickPickItem>}
     */
    const fulfilledPromise = new Promise(resolve => {
      const provider =
          new QuickPickProvider(items, resolve, options.matchOnDescription ? 0.5 : 0, options.matchOnDetail ? 0.25 : 0);
      const widget = new FilteredListWidget(provider);
      widget.setPlaceholder(options.placeHolder);
      widget.setPromptTitle(options.placeHolder);
      widget.showAsDialog(options.placeHolder);
      canceledPromise = /** @type {!Promise<undefined>} */ (widget.once('hidden'));
      widget.setQuery('');
    });

    return Promise.race([fulfilledPromise, canceledPromise]).then(values => {
      // If it was fulfilled, then `result` will have a value.
      // If it was canceled, then `result` will be undefined.
      // Either way, it has the value that we want.
      return values;
    });
  }
}

class QuickPickProvider extends Provider {
  /**
   *
   * @param {!Array<!QuickPickItem>} items
   * @param {!Function} resolve
   * @param {number=} matchOnDescription
   * @param {number=} matchOnDetail
   */
  constructor(items, resolve, matchOnDescription = 0.5, matchOnDetail = 0.25) {
    super();
    this._resolve = resolve;
    this._items = items;
    this._matchOnDescription = matchOnDescription;
    this._matchOnDetail = matchOnDetail;
  }

  /**
   * @override
   */
  itemCount() {
    return this._items.length;
  }

  /**
   * @override
   * @param {number} itemIndex
   * @return {string}
   */
  itemKeyAt(itemIndex) {
    const item = this._items[itemIndex];
    let key = item.label;
    if (this._matchOnDescription) {
      key += ' ' + item.description;
    }
    if (this._matchOnDetail) {
      key += ' ' + item.detail;
    }
    return key;
  }

  /**
   * @override
   * @param {number} itemIndex
   * @param {string} query
   * @return {number}
   */
  itemScoreAt(itemIndex, query) {
    const item = this._items[itemIndex];
    const test = query.toLowerCase();
    let score = Diff.Diff.DiffWrapper.characterScore(test, item.label.toLowerCase());

    if (this._matchOnDescription && item.description) {
      const descriptionScore = Diff.Diff.DiffWrapper.characterScore(test, item.description.toLowerCase());
      score += descriptionScore * this._matchOnDescription;
    }

    if (this._matchOnDetail && item.detail) {
      const detailScore = Diff.Diff.DiffWrapper.characterScore(test, item.detail.toLowerCase());
      score += detailScore * this._matchOnDetail;
    }

    return score;
  }

  /**
   * @override
   * @param {number} itemIndex
   * @param {string} query
   * @param {!Element} titleElement
   * @param {!Element} subtitleElement
   */
  renderItem(itemIndex, query, titleElement, subtitleElement) {
    const item = this._items[itemIndex];
    titleElement.removeChildren();
    const labelElement = titleElement.createChild('span');
    UI.UIUtils.createTextChild(labelElement, item.label);
    FilteredListWidget.highlightRanges(titleElement, query, true);
    if (item.description) {
      const descriptionElement = titleElement.createChild('span', 'quickpick-description');
      UI.UIUtils.createTextChild(descriptionElement, item.description);
      if (this._matchOnDescription) {
        FilteredListWidget.highlightRanges(descriptionElement, query, true);
      }
    }
    if (item.detail) {
      UI.UIUtils.createTextChild(subtitleElement, item.detail);
      if (this._matchOnDetail) {
        FilteredListWidget.highlightRanges(subtitleElement, query, true);
      }
    }
  }

  /**
   * @override
   * @return {boolean}
   */
  renderAsTwoRows() {
    return this._items.some(i => !!i.detail);
  }

  /**
   * @override
   * @param {?number} itemIndex
   * @param {string} _promptValue
   */
  selectItem(itemIndex, _promptValue) {
    if (typeof itemIndex === 'number') {
      this._resolve(this._items[itemIndex]);
      return;
    }

    this._resolve(undefined);
  }
}