[Files.app] Split the JavaScript files into subdirectories: common, background, and foreground

chrome/browser/resources/file_manager/js/file_watcher.js

-// Copyright 2013 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.
-
-'use strict';
-
-/**
- * Watches for changes in the tracked directory, including local metadata
- * changes.
- *
- * @param {MetadataCache} metadataCache Instance of MetadataCache.
- * @extends {cr.EventTarget}
- * @constructor
- */
-function FileWatcher(metadataCache) {
-  this.queue_ = new AsyncUtil.Queue();
-  this.metadataCache_ = metadataCache;
-  this.watchedDirectoryEntry_ = null;
-
-  this.onDirectoryChangedBound_ = this.onDirectoryChanged_.bind(this);
-  chrome.fileBrowserPrivate.onDirectoryChanged.addListener(
-      this.onDirectoryChangedBound_);
-
-  this.filesystemMetadataObserverId_ = null;
-  this.thumbnailMetadataObserverId_ = null;
-  this.driveMetadataObserverId_ = null;
-}
-
-/**
- * FileWatcher extends cr.EventTarget.
- */
-FileWatcher.prototype.__proto__ = cr.EventTarget.prototype;
-
-/**
- * Stops watching (must be called before page unload).
- */
-FileWatcher.prototype.dispose = function() {
-  chrome.fileBrowserPrivate.onDirectoryChanged.removeListener(
-      this.onDirectoryChangedBound_);
-  if (this.watchedDirectoryEntry_)
-    this.resetWatchedEntry_(function() {}, function() {});
-};
-
-/**
- * Called when a file in the watched directory is changed.
- * @param {Event} event Change event.
- * @private
- */
-FileWatcher.prototype.onDirectoryChanged_ = function(event) {
-  if (this.watchedDirectoryEntry_ &&
-      event.directoryUrl == this.watchedDirectoryEntry_.toURL()) {
-    var e = new Event('watcher-directory-changed');
-    this.dispatchEvent(e);
-  }
-};
-
-/**
- * Called when general metadata in the watched directory has been changed.
- *
- * @param {Array.<string>} urls Array of urls.
- * @param {Object.<string, Object>} properties Map from entry URLs to metadata
- *     properties.
- * @private
- */
-FileWatcher.prototype.onFilesystemMetadataChanged_ = function(
-    urls, properties) {
-  this.dispatchMetadataEvent_('filesystem', urls, properties);
-};
-
-/**
- * Called when thumbnail metadata in the watched directory has been changed.
- *
- * @param {Array.<string>} urls Array of urls.
- * @param {Object.<string, Object>} properties Map from entry URLs to metadata
- *     properties.
- * @private
- */
-FileWatcher.prototype.onThumbnailMetadataChanged_ = function(
-    urls, properties) {
-  this.dispatchMetadataEvent_('thumbnail', urls, properties);
-};
-
-/**
- * Called when drive metadata in the watched directory has been changed.
- *
- * @param {Array.<string>} urls Array of urls.
- * @param {Object.<string, Object>} properties Map from entry URLs to metadata
- *     properties.
- * @private
- */
-FileWatcher.prototype.onDriveMetadataChanged_ = function(
-    urls, properties) {
-  this.dispatchMetadataEvent_('drive', urls, properties);
-};
-
-/**
- * Dispatches an event about detected change in metadata within the tracked
- * directory.
- *
- * @param {string} type Type of the metadata change.
- * @param {Array.<string>} urls Array of urls.
- * @param {Object.<string, Object>} properties Map from entry URLs to metadata
- *     properties.
- * @private
- */
-FileWatcher.prototype.dispatchMetadataEvent_ = function(
-    type, urls, properties) {
-  var e = new Event('watcher-metadata-changed');
-  e.metadataType = type;
-  e.urls = urls;
-  e.properties = properties;
-  this.dispatchEvent(e);
-};
-
-/**
- * Changes the watched directory. In case of a fake entry, the watch is
- * just released, since there is no reason to track a fake directory.
- *
- * @param {!DirectoryEntry|!Object} entry Directory entry to be tracked, or the
- *     fake entry.
- * @param {function()} callback Completion callback.
- */
-FileWatcher.prototype.changeWatchedDirectory = function(entry, callback) {
-  if (entry && entry.toURL) {
-    this.changeWatchedEntry_(
-        entry,
-        callback,
-        function() {
-          console.error(
-             'Unable to change the watched directory to: ' + entry.toURL());
-          callback();
-        });
-  } else {
-    this.resetWatchedEntry_(
-        callback,
-        function() {
-          console.error('Unable to reset the watched directory.');
-          callback();
-        });
-  }
-};
-
-/**
- * Resets the watched entry to the passed directory.
- *
- * @param {function()} onSuccess Success callback.
- * @param {function()} onError Error callback.
- * @private
- */
-FileWatcher.prototype.resetWatchedEntry_ = function(onSuccess, onError) {
-  // Run the tasks in the queue to avoid races.
-  this.queue_.run(function(callback) {
-    // Release the watched directory.
-    if (this.watchedDirectoryEntry_) {
-      chrome.fileBrowserPrivate.removeFileWatch(
-          this.watchedDirectoryEntry_.toURL(),
-          function(result) {
-            this.watchedDirectoryEntry_ = null;
-            if (result)
-              onSuccess();
-            else
-              onError();
-            callback();
-          }.bind(this));
-      this.metadataCache_.removeObserver(this.filesystemMetadataObserverId_);
-      this.metadataCache_.removeObserver(this.thumbnailMetadataObserverId_);
-      this.metadataCache_.removeObserver(this.driveMetadataObserverId_);
-    } else {
-      onSuccess();
-      callback();
-    }
-  }.bind(this));
-};
-
-/**
- * Sets the watched entry to the passed directory.
- *
- * @param {!DirectoryEntry} entry Directory to be watched.
- * @param {function()} onSuccess Success callback.
- * @param {function()} onError Error callback.
- * @private
- */
-FileWatcher.prototype.changeWatchedEntry_ = function(
-    entry, onSuccess, onError) {
-  var setEntryClosure = function() {
-    // Run the tasks in the queue to avoid races.
-    this.queue_.run(function(callback) {
-      chrome.fileBrowserPrivate.addFileWatch(
-          entry.toURL(),
-          function(result) {
-            if (!result) {
-              this.watchedDirectoryEntry_ = null;
-              onError();
-            } else {
-              this.watchedDirectoryEntry_ = entry;
-              onSuccess();
-            }
-            callback();
-          }.bind(this));
-      this.filesystemMetadataObserverId_ = this.metadataCache_.addObserver(
-        entry,
-        MetadataCache.CHILDREN,
-        'filesystem',
-        this.onFilesystemMetadataChanged_.bind(this));
-      this.thumbnailMetadataObserverId_ = this.metadataCache_.addObserver(
-        entry,
-        MetadataCache.CHILDREN,
-        'thumbnail',
-        this.onThumbnailMetadataChanged_.bind(this));
-      this.driveMetadataObserverId_ = this.metadataCache_.addObserver(
-        entry,
-        MetadataCache.CHILDREN,
-        'drive',
-        this.onDriveMetadataChanged_.bind(this));
-    }.bind(this));
-  }.bind(this);
-
-  // Reset the watched directory first, then set the new watched directory.
-  this.resetWatchedEntry_(setEntryClosure, onError);
-};
-
-/**
- * @return {DirectoryEntry} Current watched directory entry.
- */
-FileWatcher.prototype.getWatchedDirectoryEntry = function() {
-  return this.watchedDirectoryEntry_;
-};