Move FileCopyManager to background page.

chrome/browser/resources/file_manager/js/file_manager.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.
 
 /**
  * FileManager constructor.
  *
  * FileManager objects encapsulate the functionality of the file selector
  * dialogs, as well as the full screen file manager application (though the
  * latter is not yet implemented).
  *
  * @constructor
  * @param {HTMLElement} dialogDom The DOM node containing the prototypical
  *     dialog UI.
  */
 function FileManager(dialogDom) {
+  this.console_ = console;

[dgozman, 2012/07/12 13:17:36]

Not used.

[Oleg Eterevsky, 2012/07/12 14:49:22]

Done.

   this.dialogDom_ = dialogDom;
   this.filesystem_ = null;
   this.params_ = location.search ?
                  JSON.parse(decodeURIComponent(location.search.substr(1))) :
                  {};
   if (this.params_.defaultPath && this.params_.defaultPath.indexOf('/') != 0)
     this.params_.defaultPath = '/' + this.params_.defaultPath;
 
   this.listType_ = null;
   this.showDelayTimeout_ = null;
@@ skipping 509 matching lines @@
     this.grid_.endBatchUpdates();
 
     // Show the page now unless it's already delayed.
     this.delayShow_(0);
 
     metrics.recordInterval('Load.DOM');
     metrics.recordInterval('Load.Total');
   };
 
   FileManager.prototype.initDataTransferOperations_ = function() {
-    this.copyManager_ = new FileCopyManager(this.filesystem_.root);
+    this.copyManager_ = FileCopyManagerWrapper.getInstance(
+        this.filesystem_.root);
     this.copyManager_.addEventListener('copy-progress',
                                        this.onCopyProgress_.bind(this));
     this.copyManager_.addEventListener('copy-operation-complete',
         this.onCopyManagerOperationComplete_.bind(this));
 
     var controller = this.fileTransferController_ = new FileTransferController(
         this.directoryModel_.getFileList(),
         this.directoryModel_.getFileListSelection(),
         GridItem.bind(null, this, false /* no checkbox */),
         this.copyManager_,
@@ skipping 523 matching lines @@
   FileManager.prototype.canExecute_ = function(commandId) {
     var readonly = this.isOnReadonlyDirectory();
     switch (commandId) {
       case 'copy':
       case 'cut':
         return this.document_.queryCommandEnabled(commandId);
 
       // Hack goes below, since we don't receive beforepaste event, but receive
       // beforecut and beforecopy events.
       case 'paste':
-        return this.isRenamingInProgress()
-                   ? this.document_.queryCommandEnabled(commandId)
-                   : (!!this.fileTransferController_ &&
-                      this.fileTransferController_.queryPasteCommandEnabled());
+        return this.isRenamingInProgress() ?
+                   this.document_.queryCommandEnabled(commandId) :
+                   (!!this.fileTransferController_ &&
+                    this.fileTransferController_.queryPasteCommandEnabled());
 
       case 'rename':
         return (// Initialized to the point where we have a current directory
                 !readonly &&
                 // Rename not in progress.
                 !this.isRenamingInProgress() &&
                 // Only one file selected.
                 this.selection &&
                 this.selection.totalCount == 1);
 
       case 'delete':
-        return (this.isRenamingInProgress()
-                ? this.document_.queryCommandEnabled(commandId)
-                : !readonly &&
-                  this.selection &&
-                  this.selection.totalCount > 0);
+        return (this.isRenamingInProgress() ?
+                this.document_.queryCommandEnabled(commandId) :
+                !readonly && this.selection && this.selection.totalCount > 0);
 
       case 'newfolder':
         return !readonly &&
                !this.directoryModel_.isSearching() &&
                (this.dialogType_ == FileManager.DialogType.SELECT_SAVEAS_FILE ||
                 this.dialogType_ == FileManager.DialogType.FULL_PAGE);
 
       case 'unmount':
         return true;
 
@@ skipping 3530 matching lines @@
             this.gdataSpaceInfoBar_.style.width =
                 (100 * usedSpace / result.totalSizeKB) + '%';
           } else {
             this.gdataSpaceInfoBar_.style.display = 'none';
             this.gdataSpaceInfoLabel_.textContent =
                 str('GDATA_FAILED_SPACE_INFO');
           }
         }.bind(this));
   }
 })();
+
+var fileCopyManagerWrapper = null;
+
+/**
+ * @constructor
+ * @param {DirectoryEntry} root Root directory entry.
+ */
+function FileCopyManagerWrapper(root) {
+  var copyManagerPrototype =
+      chrome.extension.getBackgroundPage().FileCopyManager.prototype;

[dgozman, 2012/07/12 13:17:36]

Does this work with unloaded background page?

[Oleg Eterevsky, 2012/07/12 14:49:22]

I wasn't able to test it.

+
+  for (var property in copyManagerPrototype) {
+    if (this[property] === undefined &&
+        typeof copyManagerPrototype[property] === 'function') {
+      this[property] = (function(p) {
+        return function() {
+          var cmInstance =
+              chrome.extension.getBackgroundPage().FileCopyManager.getInstance(
+                  root);
+          return cmInstance[p].apply(cmInstance, arguments);
+        }
+      })(property);
+    }
+  }
+}
+
+/**
+ * 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;
+};
+
+/**
+ * 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)

[dgozman, 2012/07/12 13:17:36]

if (eventArgs.hasOwnProperty(arg))

[Oleg Eterevsky, 2012/07/12 14:49:22]

Done.

+    event[arg] = eventArgs[arg];
+
+  this.dispatchEvent(event);
+};
+