DevTools: Create extensible QuickOpen control

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

+// Copyright 2016 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.QuickOpen = class {
+  /**
+   * @param {!QuickOpen.FilteredListWidget} filtedListWidget
+   */
+  constructor(filtedListWidget) {
+    this._prefix = null;

[einbinder, 2017/03/08 22:39:57]

I could expose _prefix on the filteredListWidget, but I'd still have to have a
flag here indicating whether or not a provider has been loaded.

+    this._query = '';
+    /** @type {!Map<string, function():!Promise<!QuickOpen.FilteredListWidget.Provider>>} */
+    this._providers = new Map();
+    /** @type {!Array<string>} */
+    this._prefixes = [];
+    this._filteredListWidget = filtedListWidget;
+    self.runtime.extensions(QuickOpen.FilteredListWidget.Provider).forEach(this._addProvider.bind(this));
+  }
+
+  /**
+   * @param {string} query
+   */
+  static show(query) {
+    var filteredListWidget = new QuickOpen.FilteredListWidget(null, this._history);
+    new this(filteredListWidget);
+    filteredListWidget.showAsDialog();
+    filteredListWidget.setQuery(query);
+  }
+
+  /**
+   * @param {!Runtime.Extension} extension
+   */
+  _addProvider(extension) {
+    var prefix = extension.descriptor()['prefix'];
+    this._prefixes.splice(this._prefixes.lowerBound((a, b) => b.length - a.length), 0, prefix);
+    this._providers.set(
+        prefix, /** @type {function():!Promise<!QuickOpen.FilteredListWidget.Provider>} */
+        (extension.instance.bind(extension)));
+  }
+
+  /**
+   * @param {string} query
+   */
+  _queryChanged(query) {
+    var prefix = this._prefixes.find(prefix => query.startsWith(prefix));
+    if (typeof prefix !== 'string' || this._prefix === prefix)
+      return;
+
+    this._prefix = prefix;
+    this._filteredListWidget.setPrefix(prefix);
+    this._filteredListWidget.setProvider(null);
+    this._providers.get(prefix)().then(provider => {
+      if (this._prefix !== prefix)
+        return;
+      this._filteredListWidget.setProvider(provider);
+      this._providerLoadedForTest(provider);
+    });
+  }
+
+  /**
+   * @param {!QuickOpen.FilteredListWidget.Provider} provider
+   */
+  _providerLoadedForTest(provider) {
+  }
+};
+
+QuickOpen.QuickOpen._history = [];
+
+/**
+ * @implements {UI.ActionDelegate}
+ */
+QuickOpen.QuickOpen.ShowActionDelegate = class {
+  /**
+   * @override
+   * @param {!UI.Context} context
+   * @param {string} actionId
+   * @return {boolean}
+   */
+  handleAction(context, actionId) {
+    switch (actionId) {
+      case 'quickOpen.show':
+        QuickOpen.QuickOpen.show('');
+        return true;
+    }
+    return false;
+  }
+};