Implement the basic OS-level printing mechanics on Mac

printing/printing_context.h

 // Copyright (c) 2006-2008 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_H_
 #define PRINTING_PRINTING_CONTEXT_H_
 
 #include "build/build_config.h"
 
 #if defined(OS_WIN)
 #include <ocidl.h>
 #include <commdlg.h>
 #endif
 
 #include <string>
 
+#include "app/gfx/native_widget_types.h"
 #include "base/basictypes.h"
+#include "base/logging.h"
 #include "printing/print_settings.h"
 
+#if defined(OS_MACOSX)
+#include "base/scoped_cftyperef.h"
+#ifdef __OBJC__
+@class NSPrintInfo;
+#else
+class NSPrintInfo;
+#endif  // __OBJC__
+#endif  // OS_MACOSX
+
 namespace printing {
 
 // Describe the user selected printing context for Windows. This includes the
 // OS-dependent UI to ask the user about the print settings. This class directly
 // talk to the printer and manages the document and pages breaks.
 class PrintingContext {
  public:
   // Tri-state result for user behavior-dependent functions.
   enum Result {
     OK,
     CANCEL,
     FAILED,
   };
 
   PrintingContext();
   ~PrintingContext();
 
-#if defined(OS_WIN)
   // Asks the user what printer and format should be used to print. Updates the
   // context with the select device settings.
-  Result AskUserForSettings(HWND window, int max_pages, bool has_selection);
-#endif
+  Result AskUserForSettings(gfx::NativeWindow window, int max_pages,
+                            bool has_selection);
 
   // Selects the user's default printer and format. Updates the context with the
   // default device settings.
   Result UseDefaultSettings();
 
   // Initializes with predefined settings.
   Result InitWithSettings(const PrintSettings& settings);
 
   // Reinitializes the settings to uninitialized for object reuse.
   void ResetSettings();
@@ skipping 16 matching lines @@
   // document.
   Result DocumentDone();
 
   // Cancels printing. Can be used in a multi-threaded context. Takes effect
   // immediately.
   void Cancel();
 
   // Dismiss the Print... dialog box if shown.
   void DismissDialog();
 
-#if defined(OS_WIN)
-  HDC context() {
-    return hdc_;
+  gfx::NativeDrawingContext context() {
+#if defined(OS_WIN) || defined(OS_MACOSX)
+    return context_;
+#else
+    NOTIMPLEMENTED();
+    return NULL;
+#endif
   }
-#endif
 
   const PrintSettings& settings() const {
     return settings_;
   }
 
  private:
   // Class that manages the PrintDlgEx() callbacks. This is meant to be a
   // temporary object used during the Print... dialog display.
   class CallbackHandler;
 
   // Does bookkeeping when an error occurs.
   PrintingContext::Result OnError();
 
 #if defined(OS_WIN)
   // Used in response to the user canceling the printing.
   static BOOL CALLBACK AbortProc(HDC hdc, int nCode);
 
   // Reads the settings from the selected device context. Updates settings_ and
   // its margins.
   bool InitializeSettings(const DEVMODE& dev_mode,
                           const std::wstring& new_device_name,
                           const PRINTPAGERANGE* ranges,
                           int number_ranges,
                           bool selection_only);
 
-  // Retrieves the printer's default low-level settings. hdc_ is allocated with
-  // this call.
+  // Retrieves the printer's default low-level settings. On Windows, context_ is
+  // allocated with this call.
   bool GetPrinterSettings(HANDLE printer,
                           const std::wstring& device_name);
 
   // Allocates the HDC for a specific DEVMODE.
   bool AllocateContext(const std::wstring& printer_name,
                        const DEVMODE* dev_mode);
 
   // Parses the result of a PRINTDLGEX result.
   Result ParseDialogResultEx(const PRINTDLGEX& dialog_options);
   Result ParseDialogResult(const PRINTDLG& dialog_options);
 
-  // The selected printer context.
-  HDC hdc_;
+#elif defined(OS_MACOSX)
+  // Read the settings from the given NSPrintInfo (and cache it for later use).
+  void ParsePrintInfo(NSPrintInfo* print_info);
+#endif
+
+  // On Windows, the selected printer context.
+  // On Mac, the current page's context; only valid between NewPage and PageDone
+  // call pairs.
+  gfx::NativeDrawingContext context_;
+
+#if defined(OS_MACOSX)
+  // The native print info object.
+  NSPrintInfo* print_info_;
 #endif
 
   // Complete print context settings.
   PrintSettings settings_;
 
 #ifndef NDEBUG
   // Current page number in the print job.
   int page_number_;
 #endif
 
@@ skipping 10 matching lines @@
 
   // Did the user cancel the print job.
   volatile bool abort_printing_;
 
   DISALLOW_EVIL_CONSTRUCTORS(PrintingContext);
 };
 
 }  // namespace printing
 
 #endif  // PRINTING_PRINTING_CONTEXT_H_