Move FileCopyManager to background page.

chrome/browser/resources/file_manager/js/file_copy_manager_wrapper.js

+// Copyright (c) 2012 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.
+
+var fileCopyManagerWrapper = null;
+
+/**
+ * While FileCopyManager is run in the background page, this class is used to
+ * communicate with it.
+ * @constructor
+ * @param {DirectoryEntry} root Root directory entry.
+ */
+function FileCopyManagerWrapper(root) {
+  this.root_ = root;
+}
+
+/**
+ * Extending cr.EventTarget.
+ */
+FileCopyManagerWrapper.prototype.__proto__ = cr.EventTarget.prototype;
+
+/**
+ * Create a new instance or get existing instance of FCMW.
+ * @param {DirectoryEntry} root Root directory entry.
+ * @return {FileCopyManagerWrapper}  A FileCopyManagerWrapper instance.
+ */
+FileCopyManagerWrapper.getInstance = function(root) {
+  if (fileCopyManagerWrapper === null) {
+    fileCopyManagerWrapper = new FileCopyManagerWrapper(root);
+  }
+  return fileCopyManagerWrapper;
+};
+
+/**
+ * @private
+ * @return {FileCopyManager?} Copy manager instance in the background page or
+ *     NULL if background page is not loaded.
+ */
+FileCopyManagerWrapper.prototype.getCopyManagerSync_ = function() {
+  var bg = chrome.extension.getBackgroundPage();
+  if (!bg)
+    return null;
+  return bg.FileCopyManager.getInstance(this.root_);
+};
+
+/**
+ * Load background page and call callback with copy manager as an argument.
+ * @private
+ * @param {Function} callback Function with FileCopyManager as a parameter.
+ */
+FileCopyManagerWrapper.prototype.getCopyManagerAsync_ = function(callback) {
+  chrome.runtime.getBackgroundPage(
+      function(bg) {
+        callback(bg.FileCopyManager.getInstance(this.root_));
+      }.bind(this));
+};
+
+/**
+ * Called be FileCopyManager to raise an event in this instance of FileManager.
+ * @param {string} eventName Event name.
+ * @param {Object} eventArgs Arbitratry field written to event object.
+ */
+FileCopyManagerWrapper.prototype.onEvent = function(eventName, eventArgs) {
+  var event = new cr.Event(eventName);
+  for (var arg in eventArgs)
+    if (eventArgs.hasOwnProperty(arg))
+      event[arg] = eventArgs[arg];
+
+  this.dispatchEvent(event);
+};
+
+/**
+ * Get the overall progress data of all queued copy tasks.
+ * @return {Object} An object containing the following parameters:
+ *    percentage - The percentage (0-1) of finished items.
+ *    pendingItems - The number of pending/unfinished items.
+ */
+FileCopyManagerWrapper.prototype.getProgress = function() {
+  var cm = this.getCopyManagerSync_();
+  if (cm)
+    return cm.getProgress();
+
+  return {percentage: NaN, pendingItems: 0};
+};
+
+/**
+ * @return {Object} Status object.
+ */
+FileCopyManagerWrapper.prototype.getStatus = function() {
+  var cm = this.getCopyManagerSync_();
+  if (cm)
+    return cm.getStatus();
+
+  return {
+    pendingItems: 0,
+    pendingFiles: 0,
+    pendingDirectories: 0,
+    pendingBytes: 0,
+
+    completedItems: 0,
+    completedFiles: 0,
+    completedDirectories: 0,
+    completedBytes: 0,
+
+    totalItems: 0,
+    totalFiles: 0,
+    totalDirectories: 0,
+    totalBytes: 0
+  };
+};
+
+/**
+ * Request that the current copy queue be abandoned.
+ * @param {Function} opt_callback On cancel.
+ */
+FileCopyManagerWrapper.prototype.requestCancel = function(opt_callback) {
+  this.getCopyManagerAsync_(
+      function(cm) {
+        cm.requestCancel(opt_callback);
+      });
+};
+
+/**
+ * Convert string in clipboard to entries and kick off pasting.
+ * @param {Object} clipboard Clipboard contents.
+ * @param {string} targetPath Target path.
+ * @param {boolean} targetOnGData If target is on GDrive.
+ */
+FileCopyManagerWrapper.prototype.paste = function(clipboard, targetPath,
+                                                  targetOnGData) {
+  this.getCopyManagerAsync_(
+      function(cm) {
+        cm.paste(clipboard, targetPath, targetOnGData);
+      });
+};
+