Linux: Refactor PrintDialogGtk in preparation for adding dialog-less printing.

BUG=none
TEST=Printing on Linux still works.
Review URL: http://codereview.chromium.org/6811016

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@81069 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 39 insertions, 0 deletions

diff --git a/printing/print_dialog_gtk_interface.h b/printing/print_dialog_gtk_interface.h
new file mode 100644
index 0000000..04198da
--- /dev/null
+++ b/printing/print_dialog_gtk_interface.h
@@ -0,0 +1,39 @@
+// 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 PRINTING_PRINT_DIALOG_GTK_INTERFACE_H_
+#define PRINTING_PRINT_DIALOG_GTK_INTERFACE_H_
+
+#include "base/string16.h"
+#include "printing/printing_context_cairo.h"
+
+namespace printing {
+
+// An interface for GTK printing dialogs. Classes that live outside of
+// printing/ can implement this interface and get threading requirements
+// correct without exposing those requirements to printing/.
+class PrintDialogGtkInterface {
+ public:
+  // Shows the dialog and handles the response with |callback|.
+  virtual void ShowDialog(
+      PrintingContextCairo::PrintSettingsCallback* callback) = 0;
+
+  // Prints the document named |document_name| contained in |metafile|.
+  // Called from the print worker thread. Once called, the
+  // PrintDialogGtkInterface instance should not be reused.
+  virtual void PrintDocument(const NativeMetafile* metafile,
+                             const string16& document_name) = 0;
+
+  // Same as AddRef/Release, but with different names since
+  // PrintDialogGtkInterface does not inherit from RefCounted.
+  virtual void AddRefToDialog() = 0;
+  virtual void ReleaseDialog() = 0;
+
+ protected:
+  virtual ~PrintDialogGtkInterface() {}
+};
+
+}  // namespace printing
+
+#endif  // PRINTING_PRINT_DIALOG_GTK_INTERFACE_H_