Print Preview: Hook up the print button to initiate printing without displaying a print dialog.

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/scoped_ptr.h"
 #include "base/shared_memory.h"
 #include "base/time.h"
 #include "chrome/renderer/render_view_observer.h"
 #include "printing/native_metafile.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebFrameClient.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebViewClient.h"
 #include "ui/gfx/size.h"
 
+class DictionaryValue;
+
 namespace gfx {
 class Size;
 }
 
 #if defined(USE_X11)
 namespace skia {
 class VectorCanvas;
 }
 #endif
 
@@ skipping 50 matching lines @@
   explicit PrintWebViewHelper(RenderView* render_view);
   virtual ~PrintWebViewHelper();
 
   // Prints |frame|.
   void PrintFrame(WebKit::WebFrame* frame,
                   bool script_initiated,
                   bool is_preview);
 
   // Message handlers.  Public for testing.
   void OnPrintingDone(int document_cookie, bool success);
-  void OnPrintForPrintPreview();
+
+  // Print the pages for print preview. Do not display the native print dialog
+  // for user settings. |job_settings| has new print job settings values.
+  void OnPrintForPrintPreview(const DictionaryValue& job_settings);
+
   void OnPrintPages();
   void OnPrintPreview();
   void OnPrintNodeUnderContextMenu();
 
  protected:
   bool CopyAndPrint(WebKit::WebFrame* web_frame);
 
   // Prints the page listed in |params|.
 #if defined(USE_X11)
   void PrintPage(const ViewMsg_PrintPage_Params& params,
@@ skipping 47 matching lines @@
              bool is_preview);
 
   void UpdatePrintableSizeInPrintParameters(WebKit::WebFrame* frame,
                                             WebKit::WebNode* node,
                                             ViewMsg_Print_Params* params);
 
   // 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
+  // copies, page range, etc.
+  bool UpdatePrintSettings(const DictionaryValue& job_settings);
+
   // Get the default printer settings.
   bool GetDefaultPrintSettings(WebKit::WebFrame* frame,
                                WebKit::WebNode* node,
                                ViewMsg_Print_Params* params);
 
   // Get final print settings from the user.
   // Return false if the user cancels or on error.
   bool GetPrintSettingsFromUser(WebKit::WebFrame* frame,
                                 int expected_pages_count,
                                 bool use_browser_overlays);
@@ skipping 35 matching lines @@
   scoped_ptr<ViewMsg_PrintPages_Params> print_pages_params_;
   base::Time last_cancelled_script_print_;
   int user_cancelled_scripted_print_count_;
   bool is_preview_;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(PrintWebViewHelper);
 };
 
 #endif  // CHROME_RENDERER_PRINT_WEB_VIEW_HELPER_H_