src/ui/shell_dialogs/print_settings_dialog_win.h

   1 // Copyright 2013 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef UI_SHELL_DIALOGS_PRINT_SETTINGS_DIALOG_WIN_H_
   6 #define UI_SHELL_DIALOGS_PRINT_SETTINGS_DIALOG_WIN_H_
   7
   8 #include <ocidl.h>
   9 #include <commdlg.h>
  10
  11 #include "base/memory/ref_counted.h"
  12 #include "base/memory/scoped_ptr.h"
  13 #include "base/message_loop/message_loop.h"
  14 #include "base/message_loop/message_loop_proxy.h"
  15 #include "ui/shell_dialogs/base_shell_dialog_win.h"
  16 #include "ui/shell_dialogs/shell_dialogs_export.h"
  17
  18 namespace ui {
  19
  20 // A thin wrapper around the native window print dialog that uses
  21 // BaseShellDialog to have the dialog run on a background thread.
  22 class SHELL_DIALOGS_EXPORT PrintSettingsDialogWin
  23     : public base::RefCountedThreadSafe<PrintSettingsDialogWin>,
  24       public BaseShellDialogImpl {
  25  public:
  26   class SHELL_DIALOGS_EXPORT Observer {
  27    public:
  28     virtual void PrintSettingsConfirmed(PRINTDLGEX* dialog_options) = 0;
  29     virtual void PrintSettingsCancelled(PRINTDLGEX* dialog_options) = 0;
  30   };
  31   typedef HRESULT(__stdcall* PrintDialogFunc)(PRINTDLGEX*);
  32
  33   explicit PrintSettingsDialogWin(Observer* observer);
  34   virtual ~PrintSettingsDialogWin();
  35
  36   // Called to open the system print dialog on a background thread.
  37   // |print_dialog_func| should generally be ::PrintDlgEx, however alternate
  38   // functions are used for testing. |owning_window| is the parent HWND, and
  39   // |dialog_options| is passed to |print_dialog_func|.
  40   void GetPrintSettings(
  41       PrintDialogFunc print_dialog_func,
  42       HWND owning_window,
  43       PRINTDLGEX* dialog_options);
  44
  45  private:
  46   // A struct for holding all the state necessary for displaying the print
  47   // settings dialog.
  48   struct ExecutePrintSettingsParams {
  49     ExecutePrintSettingsParams(RunState run_state,
  50                                HWND owner,
  51                                PrintDialogFunc print_dialog_func,
  52                                PRINTDLGEX* dialog_options)
  53         : run_state(run_state),
  54           owner(owner),
  55           print_dialog_func(print_dialog_func),
  56           dialog_options(dialog_options),
  57           ui_proxy(base::MessageLoopForUI::current()->message_loop_proxy()) {}
  58
  59     RunState run_state;
  60     HWND owner;
  61     PrintDialogFunc print_dialog_func;
  62     PRINTDLGEX* dialog_options;
  63     scoped_refptr<base::MessageLoopProxy> ui_proxy;
  64   };
  65
  66   // Runs the print dialog. Should be run on the the BaseShellDialogImpl thread.
  67   // Posts back to PrintSettingsCompleted on the UI thread on completion.
  68   void ExecutePrintSettings(const ExecutePrintSettingsParams& params);
  69
  70   // Handler for the result of the print settings dialog. Should be run on the
  71   // UI thread, and notifies the observer of the result of the dialog.
  72   void PrintSettingsCompleted(HRESULT hresult,
  73                               const ExecutePrintSettingsParams& params);
  74
  75   // Observer that's notified when the dialog is confirmed or cancelled.
  76   Observer* observer_;
  77
  78   DISALLOW_COPY_AND_ASSIGN(PrintSettingsDialogWin);
  79 };
  80
  81 }  // namespace ui
  82
  83 #endif  // UI_SHELL_DIALOGS_PRINT_SETTINGS_DIALOG_WIN_H_