DownloadManagerDelegate::ShouldCompleteDownload(callback)

content/public/browser/download_manager_delegate.h

 // 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.
 
 #ifndef CONTENT_PUBLIC_BROWSER_DOWNLOAD_MANAGER_DELEGATE_H_
 #define CONTENT_PUBLIC_BROWSER_DOWNLOAD_MANAGER_DELEGATE_H_
 #pragma once
 
 #include "base/basictypes.h"
 #include "base/callback.h"
@@ skipping 50 matching lines @@
   virtual FilePath GetIntermediatePath(const FilePath& suggested_path);
 
   // Called when the download system wants to alert a WebContents that a
   // download has started, but the TabConetnts has gone away. This lets an
   // delegate return an alternative WebContents. The delegate can return NULL.
   virtual WebContents* GetAlternativeWebContentsToNotifyForDownload();
 
   // Tests if a file type should be opened automatically.
   virtual bool ShouldOpenFileBasedOnExtension(const FilePath& path);
 
-  // Allows the delegate to override completion of the download.  If this
-  // function returns false, the download completion is delayed and the
-  // delegate is responsible for making sure that
-  // DownloadItem::MaybeCompleteDownload is called at some point in the
-  // future.  Note that at that point this function will be called again,
-  // and is responsible for returning true when it really is ok for the
-  // download to complete.
-  virtual bool ShouldCompleteDownload(DownloadItem* item);
+  // Allows the delegate to delay completion of the download.  This function
+  // will either return true (in which case the download is ready to complete)
+  // or arrange for complete_callback to be called at some point in the future
+  // when the download is ready to complete.
+  //
+  // ShouldCompleteDownload() may be called multiple times; if it is, only the
+  // last callback specified (while the delegate is delaying completion) will be
+  // run.  Calls made after the callback is run are guaranteed to return true.
+  virtual bool ShouldCompleteDownload(
+      DownloadItem* item,
+      const base::Closure& complete_callback);
 
   // Allows the delegate to override opening the download. If this function
   // returns false, the delegate needs to call
   // DownloadItem::DelayedDownloadOpened when it's done with the item,
   // and is responsible for opening it.  This function is called
   // after the final rename, but before the download state is set to COMPLETED.
   virtual bool ShouldOpenDownload(DownloadItem* item);
 
   // Returns true if we need to generate a binary hash for downloads.
   virtual bool GenerateFileHash();
@@ skipping 36 matching lines @@
                               const FilePath& suggested_path,
                               const FilePath::StringType& default_extension,
                               bool can_save_as_complete,
                               const SavePackagePathPickedCallback& callback) {
   }
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_DOWNLOAD_MANAGER_DELEGATE_H_