Block printing through JS when printing is disabled by policy or pref

chrome/browser/printing/print_view_manager.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 CHROME_BROWSER_PRINTING_PRINT_VIEW_MANAGER_H_
 #define CHROME_BROWSER_PRINTING_PRINT_VIEW_MANAGER_H_
 
 #include "base/memory/ref_counted.h"
 #include "base/string16.h"
+#include "chrome/browser/prefs/pref_member.h"
 #include "content/public/browser/notification_observer.h"
 #include "content/public/browser/notification_registrar.h"
 #include "content/public/browser/web_contents_observer.h"
 #include "printing/printed_pages_source.h"
 
 class TabContents;
 struct PrintHostMsg_DidPrintPage_Params;
 
 namespace content {
 class RenderProcessHost;
+class RenderViewHost;
 }
 
 namespace printing {
 
 class JobEventDetails;
 class PrintJob;
 class PrintJobWorkerOwner;
 class PrintViewManagerObserver;
 
 // Manages the print commands in relation to a TabContents.
@@ skipping 32 matching lines @@
   bool PrintPreviewNow();
 
   // Notify PrintViewManager that print preview is starting in the renderer for
   // a particular WebNode.
   void PrintPreviewForWebNode();
 
   // Notify PrintViewManager that print preview has finished. Unfreeze the
   // renderer in the case of scripted print preview.
   void PrintPreviewDone();
 
-  // Whether to block scripted printing or not.
-  void SetScriptedPrintingBlocked(bool blocked);
+  // Whether to block scripted printing for our tab or not.
+  void UpdateScriptedPrintingBlocked();
 
   // Sets |observer| as the current PrintViewManagerObserver. Pass in NULL to
   // remove the current observer. |observer| may always be NULL, but |observer_|
   // must be NULL if |observer| is non-NULL.
   void set_observer(PrintViewManagerObserver* observer);
 
   // PrintedPagesSource implementation.
   virtual string16 RenderSourceName() OVERRIDE;
 
   // content::NotificationObserver implementation.
   virtual void Observe(int type,
                        const content::NotificationSource& source,
                        const content::NotificationDetails& details) OVERRIDE;
 
   // content::WebContentsObserver implementation.
+  virtual void DidStartLoading(
+      content::RenderViewHost* render_view_host) OVERRIDE;
+
+  // content::WebContentsObserver implementation.
   virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE;
 
   // Terminates or cancels the print job if one was pending.
   virtual void RenderViewGone(base::TerminationStatus status) OVERRIDE;
 
   // Cancels the print job.
   virtual void StopNavigation() OVERRIDE;
 
  private:
   enum PrintPreviewState {
@@ skipping 97 matching lines @@
 
   // The document cookie of the current PrinterQuery.
   int cookie_;
 
   // Current state of print preview for this view.
   PrintPreviewState print_preview_state_;
 
   // Keeps track of the pending callback during scripted print preview.
   content::RenderProcessHost* scripted_print_preview_rph_;
 
+  // Whether printing is enabled.
+  BooleanPrefMember printing_enabled_;
+
+  // Whether our tab content is in blocked state.
+  bool tab_content_blocked_;
+
   DISALLOW_COPY_AND_ASSIGN(PrintViewManager);
 };
 
 }  // namespace printing
 
 #endif  // CHROME_BROWSER_PRINTING_PRINT_VIEW_MANAGER_H_