DevTools: Show a list of availble QuickOpen providers

third_party/WebKit/Source/devtools/front_end/quick_open/HelpQuickOpen.js

+// Copyright 2017 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.
+QuickOpen.HelpQuickOpen = class extends QuickOpen.FilteredListWidget.Provider {
+  constructor() {
+    super();
+    /** @type {!Array<{prefix: string, title: string}>} */
+    this._providers = [];
+    self.runtime.extensions(QuickOpen.FilteredListWidget.Provider).forEach(this._addProvider.bind(this));
+  }
+
+  /**
+   * @param {!Runtime.Extension} extension
+   */
+  _addProvider(extension) {
+    if (extension.descriptor()['title'])
+      this._providers.push({prefix: extension.descriptor()['prefix'], title: extension.descriptor()['title']});
+  }
+
+  /**
+   * @override
+   * @return {number}
+   */
+  itemCount() {
+    return this._providers.length;
+  }
+
+  /**
+   * @override
+   * @param {number} itemIndex
+   * @return {string}
+   */
+  itemKeyAt(itemIndex) {
+    return this._providers[itemIndex].prefix;
+  }
+
+  /**
+   * @override
+   * @param {number} itemIndex
+   * @param {string} query
+   * @return {number}
+   */
+  itemScoreAt(itemIndex, query) {
+    return -this._providers[itemIndex].prefix.length;
+  }
+
+  /**
+   * @override
+   * @param {number} itemIndex
+   * @param {string} query
+   * @param {!Element} titleElement
+   * @param {!Element} subtitleElement
+   */
+  renderItem(itemIndex, query, titleElement, subtitleElement) {
+    var provider = this._providers[itemIndex];
+    var prefixElement = titleElement.createChild('span', 'monospace');
+    prefixElement.textContent = (provider.prefix || '\u2026') + ' ';
+    titleElement.createTextChild(provider.title);
+  }
+
+  /**
+   * @override
+   * @param {?number} itemIndex
+   * @param {string} promptValue
+   */
+  selectItem(itemIndex, promptValue) {
+    if (itemIndex !== null)
+      QuickOpen.QuickOpen.show(this._providers[itemIndex].prefix);
+  }
+
+  /**
+   * @override
+   * @return {boolean}
+   */
+  renderAsTwoRows() {
+    return false;
+  }
+};