Print directly to CUPS using the IPP APIs

printing/printing_context_chromeos.h

-// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// Copyright 2016 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_PRINTING_CONTEXT_NO_SYSTEM_DIALOG_H_
-#define PRINTING_PRINTING_CONTEXT_NO_SYSTEM_DIALOG_H_
+#ifndef PRINTING_PRINTING_CONTEXT_CHROMEOS_H_
+#define PRINTING_PRINTING_CONTEXT_CHROMEOS_H_
 
+#include <memory>
 #include <string>
+#include <vector>
 
 #include "base/macros.h"
+#include "printing/backend/cups_connection.h"
+#include "printing/backend/cups_printer.h"
+#include "printing/backend/print_backend.h"

[Lei Zhang, 2016/07/20 01:26:57]

is this needed here?

[skau, 2016/07/22 23:36:14]

Done.

 #include "printing/printing_context.h"
 
 namespace base {
 class DictionaryValue;
 }
 
 namespace printing {
 
-class PRINTING_EXPORT PrintingContextNoSystemDialog : public PrintingContext {
+class PRINTING_EXPORT PrintingContextChromeos : public PrintingContext {
  public:
-  explicit PrintingContextNoSystemDialog(Delegate* delegate);
-  ~PrintingContextNoSystemDialog() override;
+  explicit PrintingContextChromeos(Delegate* delegate);
+  ~PrintingContextChromeos() override;
 
   // PrintingContext implementation.
   void AskUserForSettings(int max_pages,
                           bool has_selection,
                           bool is_scripted,
                           const PrintSettingsCallback& callback) override;
   Result UseDefaultSettings() override;
   gfx::Size GetPdfPaperSizeDeviceUnits() override;
   Result UpdatePrinterSettings(bool external_preview,
                                bool show_system_dialog,
                                int page_count) override;
   Result InitWithSettings(const PrintSettings& settings) override;
+
+  Result StreamData(const std::vector<char>& buffer);

[Lei Zhang, 2016/07/20 01:26:57]

Don't squeeze this into the middle of a list of overrides.

[skau, 2016/07/22 23:36:14]

Done.

+
   Result NewDocument(const base::string16& document_name) override;
   Result NewPage() override;
   Result PageDone() override;
   Result DocumentDone() override;
   void Cancel() override;
   void ReleaseContext() override;
   gfx::NativeDrawingContext context() const override;
 
  private:
-  DISALLOW_COPY_AND_ASSIGN(PrintingContextNoSystemDialog);
+  // Lazily initializes |printer_|.
+  Result InitializeDevice(const std::string& device);
+
+  // id for ongoing print job.  -1 if no job is active.
+  int job_id_;
+
+  CupsConnection connection_;
+  std::unique_ptr<CupsPrinter> printer_;
+
+  DISALLOW_COPY_AND_ASSIGN(PrintingContextChromeos);
 };
 
 }  // namespace printing
 
-#endif  // PRINTING_PRINTING_CONTEXT_NO_SYSTEM_DIALOG_H_
+#endif  // PRINTING_PRINTING_CONTEXT_CHROMEOS_H_