Print support for Windows Metro...

printing/printed_document.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 PRINTING_PRINTED_DOCUMENT_H_
 #define PRINTING_PRINTED_DOCUMENT_H_
 
 #include <map>
 
 #include "base/memory/ref_counted.h"
@@ skipping 14 matching lines @@
 
 // A collection of rendered pages. The settings are immutable. If the print
 // settings are changed, a new PrintedDocument must be created.
 // Warning: May be accessed from many threads at the same time. Only one thread
 // will have write access. Sensible functions are protected by a lock.
 // Warning: Once a page is loaded, it cannot be replaced. Pages may be discarded
 // under low memory conditions.
 class PRINTING_EXPORT PrintedDocument
     : public base::RefCountedThreadSafe<PrintedDocument> {
  public:
+  // A delegate can be used to deviated the rendering of the pages to a
+  // specific destination.
+  class Delegate: public base::RefCountedThreadSafe<Delegate> {

[Albert Bodenhamer, 2012/06/15 18:41:24]

Perhaps "PrintDestinationInterface" instead of "Delegate"?  I'd go as far as to
pull it into its own header.

[MAD, 2012/06/19 14:24:10]

Good idea... Will do...

[MAD, 2012/06/28 15:48:14]

Done.

+   public:
+    virtual void SetPageCount(int page_count) = 0;
+    virtual void SetPageContent(int page_number,
+                                void* content,
+                                size_t content_size) = 0;
+  };
+
   // The cookie shall be unique and has a specific relationship with its
   // originating source and settings.
   PrintedDocument(const PrintSettings& settings,
                   PrintedPagesSource* source,
+                  Delegate* delegate,
                   int cookie);
 
   // Sets a page's data. 0-based. Takes metafile ownership.
   // Note: locks for a short amount of time.
   void SetPage(int page_number, Metafile* metafile, double shrink,
                const gfx::Size& paper_size, const gfx::Rect& page_rect);
 
   // Retrieves a page. If the page is not available right now, it
   // requests to have this page be rendered and returns false.
   // Note: locks for a short amount of time.
@@ skipping 80 matching lines @@
 #if defined(OS_POSIX) && !defined(OS_MACOSX)
     // Page number of the first page.
     int first_page;
 #endif
   };
 
   // Contains all the immutable stuff. All this stuff can be accessed without
   // any lock held. This is because it can't be changed after the object's
   // construction.
   struct Immutable {
-    Immutable(const PrintSettings& settings, PrintedPagesSource* source,
+    Immutable(const PrintSettings& settings,
+              PrintedPagesSource* source,
+              Delegate* delegate,
               int cookie);
     ~Immutable();
 
     // Print settings used to generate this document. Immutable.
     PrintSettings settings_;
 
     // Native thread for the render source.
     MessageLoop* source_message_loop_;
 
     // Document name. Immutable.
     string16 name_;
 
+    // A potential Delegate where to redirect page rendering if not NULL.
+    Delegate* delegate_;
+
     // Cookie to uniquely identify this document. It is used to make sure that a
     // PrintedPage is correctly belonging to the PrintedDocument. Since
     // PrintedPage generation is completely asynchronous, it could be easy to
     // mess up and send the page to the wrong document. It can be viewed as a
     // simpler hash of PrintSettings since a new document is made each time the
     // print settings change.
     int cookie_;
   };
 
   void DebugDump(const PrintedPage& page);
 
   // All writable data member access must be guarded by this lock. Needs to be
   // mutable since it can be acquired from const member functions.
   mutable base::Lock lock_;
 
   // All the mutable members.
   Mutable mutable_;
 
   // All the immutable members.
   const Immutable immutable_;
 
   DISALLOW_COPY_AND_ASSIGN(PrintedDocument);
 };
 
 }  // namespace printing
 
 #endif  // PRINTING_PRINTED_DOCUMENT_H_