Print Preview: Display a throbber when the user requests the system print

chrome/renderer/print_web_view_helper.h

 // Copyright (c) 2011 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 CHROME_RENDERER_PRINT_WEB_VIEW_HELPER_H_
 #define CHROME_RENDERER_PRINT_WEB_VIEW_HELPER_H_
 #pragma once
 
 #include "base/memory/scoped_ptr.h"
 #include "base/shared_memory.h"
@@ skipping 44 matching lines @@
   gfx::Size print_canvas_size_;
   gfx::Size prev_view_size_;
   gfx::Size prev_scroll_offset_;
   int expected_pages_count_;
   bool use_browser_overlays_;
   bool finished_;
 
   DISALLOW_COPY_AND_ASSIGN(PrepareFrameAndViewForPrint);
 };
 
-
 // PrintWebViewHelper handles most of the printing grunt work for RenderView.
 // We plan on making print asynchronous and that will require copying the DOM
 // of the document and creating a new WebView with the contents.
-class PrintWebViewHelper : public RenderViewObserver ,
+class PrintWebViewHelper : public RenderViewObserver,
                            public RenderViewObserverTracker<PrintWebViewHelper>,
                            public WebKit::WebViewClient,
                            public WebKit::WebFrameClient {
  public:
   explicit PrintWebViewHelper(RenderView* render_view);
   virtual ~PrintWebViewHelper();
 
  protected:
   // WebKit::WebViewClient override:
   virtual void didStopLoading();
@@ skipping 45 matching lines @@
   void PrintPreview(WebKit::WebFrame* frame,
                     WebKit::WebNode* node,
                     const DictionaryValue& settings);
 
   enum PrintingResult {
     OK,
     FAIL_PRINT,
     FAIL_PREVIEW,
   };
 
-  // Notification when printing is done - signal teardown/free resources.
+  // Notification when printing is done - signal tear-down/free resources.
   void DidFinishPrinting(PrintingResult result);
 
   // Print Settings -----------------------------------------------------------
 
   // Initialize print page settings with default settings.
   bool InitPrintSettings(WebKit::WebFrame* frame,
                          WebKit::WebNode* node);
 
   // Update the current print settings with new |job_settings|. |job_settings|
   // dictionary contains print job details such as printer name, number of
@@ skipping 134 matching lines @@
   // the failure came from the browser in the first place.
   bool notify_browser_of_print_failure_;
 
   int preview_page_count_;
   scoped_ptr<PrintMsg_PrintPages_Params> old_print_pages_params_;
 
   DISALLOW_COPY_AND_ASSIGN(PrintWebViewHelper);
 };
 
 #endif  // CHROME_RENDERER_PRINT_WEB_VIEW_HELPER_H_