Linux: Refactor printing to be more like Windows/Mac....

chrome/browser/printing/print_dialog_gtk.h

-// Copyright (c) 2009 The Chromium Authors. All rights reserved.
+// 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_BROWSER_PRINTING_PRINT_DIALOG_GTK_H_
 #define CHROME_BROWSER_PRINTING_PRINT_DIALOG_GTK_H_
 #pragma once
 
 #include <gtk/gtk.h>
+#include <gtk/gtkprintunixdialog.h>
 
-#include "base/basictypes.h"
 #include "base/file_path.h"
+#include "base/ref_counted.h"
+#include "printing/native_metafile.h"
+#include "printing/printing_context_cairo.h"
 #include "ui/base/gtk/gtk_signal.h"
 
-class Browser;
+namespace base {
+class WaitableEvent;
+}
 
-typedef struct _GtkPrintJob GtkPrintJob;
+using printing::NativeMetafile;
+using printing::PrintingContextCairo;
 
-// Currently this dialog only allows the user to choose a printer.
-class PrintDialogGtk {
+class PrintDialogGtk : public base::RefCountedThreadSafe<PrintDialogGtk> {
  public:
-  static bool DialogShowing();
+  // Creates and returns a print dialog. The dialog will initialize the settings
+  // for |context| and call |callback| to inform the print workflow of the
+  // dialog results.
+  static void* CreatePrintDialog(
+      PrintingContextCairo::PrintSettingsCallback* callback,
+      PrintingContextCairo* context);
 
-  // Called on the IO thread.
-  static void CreatePrintDialogForPdf(const FilePath& path);
+  // Prints a document named |document_name| based on the settings in
+  // |print_dialog|, with data from |metafile|.
+  // Called from the print worker thread.
+  static void PrintDocument(void* print_dialog,
+                            const NativeMetafile* metafile,
+                            const string16& document_name);
 
  private:
-  explicit PrintDialogGtk(const FilePath& path_to_pdf);
+  friend class base::RefCountedThreadSafe<PrintDialogGtk>;
+
+  PrintDialogGtk(PrintingContextCairo::PrintSettingsCallback* callback,
+                 PrintingContextCairo* context);
   ~PrintDialogGtk();
 
-  static void CreateDialogImpl(const FilePath& path);
-
+  // Handles dialog response.
   CHROMEGTK_CALLBACK_1(PrintDialogGtk, void, OnResponse, gint);
 
+  // Saves data in |metafile| to disk for document named |document_name|.
+  void SaveDocumentToDisk(const NativeMetafile* metafile,
+                          const string16& document_name);
+
+  // Prints document named |document_name|.
+  void SendDocumentToPrinter(const string16& document_name);
+
+  // Handles print job response.
   static void OnJobCompletedThunk(GtkPrintJob* print_job,
                                   gpointer user_data,
                                   GError* error);
-  void OnJobCompleted(GtkPrintJob* job, GError* error);
+  void OnJobCompleted(GtkPrintJob* print_job, GError* error);
 
+  void set_save_document_event(base::WaitableEvent* event);
+
+  // Printing dialog callback.
+  PrintingContextCairo::PrintSettingsCallback* callback_;
+  PrintingContextCairo* context_;
+
+  // Print dialog settings.
+  GtkWidget* dialog_;
+  GtkPageSetup* page_setup_;
+  GtkPrinter* printer_;
+  GtkPrintSettings* gtk_settings_;
+
+  // Event to signal when save document finishes.
+  base::WaitableEvent* save_document_event_;
   FilePath path_to_pdf_;
 
-  GtkWidget* dialog_;
-
-  Browser* browser_;
-
   DISALLOW_COPY_AND_ASSIGN(PrintDialogGtk);
 };
 
 #endif  // CHROME_BROWSER_PRINTING_PRINT_DIALOG_GTK_H_