Files app: Initial impl of launchParams.searchQuery

If launchParams.searchQuery is set,
1) Performs a search at Files app start up.
2) Select the first root directory that contains one or more query-matched files.

Also did refactoring around DirectoryModel.createDirectoryContents_(...)
- Split createDirectoryContents_ into 2 functions
  isSearchDirectory(...) and createScannerFactory()
- Removed all DirectoryContents.createFor*(...) functions.

For now we expect that the searchQuery param is used only when Files app is launched as Android file picker.
1) and 2) are required by DocumentsUI CTS (See go/arc-r-documents-ui)

Bug: 1126742
Test: atest DocumentsTest#testGetContentWithQuery_matchingFileShowing
Change-Id: I1a76a93ee7fbf7ce7ae3fdd2a3dc408311bbd12a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2408502Reviewed-by: Naoki Fukino <fukino@chromium.org>
Reviewed-by: Luciano Pacheco <lucmult@chromium.org>
Auto-Submit: Satoshi Niwa <niwa@chromium.org>
Commit-Queue: Satoshi Niwa <niwa@chromium.org>
Cr-Commit-Position: refs/heads/master@{#811043}

ui/file_manager/file_manager/foreground/js/BUILD.gn

@@ -30,6 +30,7 @@ js_type_check("closure_compile_module") {
     ":closure_compile_externs",
     ":column_visibility_controller",
     ":constants",
+    ":crossover_search_utils",
     ":crostini_controller",
     ":dialog_action_controller",
     ":dialog_type",
@@ -235,6 +236,9 @@ js_library("column_visibility_controller") {
 js_library("constants") {
 }
 
+js_library("crossover_search_utils") {
+}
+
 js_library("crostini_controller") {
   deps = [
     ":directory_model",

ui/file_manager/file_manager/foreground/js/crossover_search_utils.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.
+
+/**
+ * Namespace for crossover search utility functions.
+ * @namespace
+ */
+const crossoverSearchUtils = {};
+
+/**
+ * Return DirectoryEntry of the first root directory that contains one or more
+ *     query-matched files.
+ * @param {NavigationListModel} navListModel
+ * @param {DirectoryModel} dirModel
+ * @param {string} searchQuery Search query.
+ * @return {!Promise<DirectoryEntry>} DirectoryEntry of the first root
+ *     directory (of type ENTRY_LIST or VOLUME) containing one or more files
+ *     that match the search query.
+ *     Returns null if no such directory is found.
+ */
+crossoverSearchUtils.findQueryMatchedDirectoryEntry =
+    async (navListModel, dirModel, searchQuery) => {
+  for (let i = 0; i < navListModel.length; i++) {
+    const item = navListModel.item(i);
+    let dirEntry;
+    switch (item.type) {
+      case NavigationModelItemType.ENTRY_LIST:  // My files, Removable, etc.
+        dirEntry = /** @type {NavigationModelFakeItem} */
+            (item).entry.getNativeEntry();
+        break;
+      case NavigationModelItemType.VOLUME:  // Drive, DocumentsProvider, etc.
+        dirEntry = /** @type {NavigationModelVolumeItem} */
+            (item).volumeInfo.displayRoot;
+        break;
+      default:
+        continue;
+    }
+    if (!dirEntry) {
+      continue;
+    }
+
+    let isMatchedEntryFound;
+    function entriesCallback(entries) {
+      isMatchedEntryFound = true;
+    }
+    function errorCallback(error) {
+      console.warn(error.stack || error);
+    }
+
+    const scanner = dirModel.createScannerFactory(dirEntry, searchQuery)();
+    await new Promise(
+        resolve => scanner.scan(
+            entriesCallback.bind(this), resolve, errorCallback.bind(this)));
+    if (isMatchedEntryFound) {
+      return dirEntry;
+    }
+  }
+  return null;
+};

ui/file_manager/file_manager/foreground/js/file_manager.js

@@ -1268,6 +1268,22 @@ class FileManager extends cr.EventTarget {
       }
     }
 
+    // If searchQuery param is set, find the first directory that matches the
+    // query, and select it if exists.
+    const searchQuery = this.launchParams_.searchQuery;
+    if (searchQuery) {
+      this.searchController_.setSearchQuery(searchQuery);
+      // Show a spinner, as the crossover search function call could be slow.
+      const hideSpinnerCallback = this.spinnerController_.show();
+      const queryMatchedDirEntry =
+          await crossoverSearchUtils.findQueryMatchedDirectoryEntry(
+              this.directoryTree.dataModel_, this.directoryModel_, searchQuery);
+      if (queryMatchedDirEntry) {
+        nextCurrentDirEntry = queryMatchedDirEntry;
+      }
+      hideSpinnerCallback();
+    }
+
     // Resolve the currentDirectoryURL to currentDirectoryEntry (if not done by
     // the previous step).
     if (!nextCurrentDirEntry && this.launchParams_.currentDirectoryURL) {
@@ -1392,6 +1408,9 @@ class FileManager extends cr.EventTarget {
         if (opt_selectionEntry) {
           this.directoryModel_.selectEntry(opt_selectionEntry);
         }
+        if (this.launchParams_.searchQuery) {
+          this.searchController_.setSearchQuery(this.launchParams_.searchQuery);
+        }
       } else {
         console.warn('No entry for finishSetupCurrentDirectory_');
       }

ui/file_manager/file_manager/foreground/js/launch_param.js

@@ -80,6 +80,12 @@ class LaunchParam {
           overrideCwsContainerOriginForTest: ''
         };
 
+    /**
+     * @type {string}
+     * @const
+     */
+    this.searchQuery = unformatted['searchQuery'] || '';
+
     /**
      * @type {boolean}
      * @const

ui/file_manager/file_manager/foreground/js/main_scripts.js

@@ -88,6 +88,7 @@
 // <include src="../../common/js/importer_common.js">
 //
 // <include src="constants.js">
+// <include src="crossover_search_utils.js">
 // <include src="web_store_utils.js">
 // <include src="ui/multi_menu.js">
 // <include src="ui/multi_menu_button.js">

ui/file_manager/file_manager/foreground/js/search_controller.js

@@ -87,6 +87,16 @@ class SearchController {
     }
   }
 
+  /**
+   * Sets search query on the search box and performs a search.
+   * @param {string} searchQuery Search query string to be searched with.
+   */
+  setSearchQuery(searchQuery) {
+    this.searchBox_.inputElement.focus();
+    this.searchBox_.inputElement.value = searchQuery;
+    this.onTextChange_();
+  }
+
   /**
    * Handles text change event.
    * @private