chrome_frame/simple_resource_loader.h

   1 // Copyright (c) 2010 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 // This class implements a simplified and much stripped down version of
   6 // Chrome's app/resource_bundle machinery. It notably avoids unwanted
   7 // dependencies on things like Skia.
   8 //
   9
  10 #ifndef CHROME_FRAME_SIMPLE_RESOURCE_LOADER_H_
  11 #define CHROME_FRAME_SIMPLE_RESOURCE_LOADER_H_
  12
  13 #include <windows.h>
  14 #include <string>
  15
  16 #include "base/singleton.h"
  17
  18 class SimpleResourceLoader {
  19  public:
  20
  21   static SimpleResourceLoader* instance() {
  22     return Singleton<SimpleResourceLoader>::get();
  23   }
  24
  25   // Helper method to return the string resource identified by message_id
  26   // from the currently loaded locale dll.
  27   static std::wstring Get(int message_id);
  28
  29   // Retrieves the HINSTANCE of the loaded module handle. May be NULL if a
  30   // resource DLL could not be loaded.
  31   HINSTANCE GetResourceModuleHandle();
  32
  33  private:
  34   SimpleResourceLoader();
  35
  36   // Retrieves the system locale in the <language>-<region> format using ICU.
  37   std::wstring GetSystemLocale();
  38
  39   // Uses |locale| to build the resource DLL name and then looks for the named
  40   // DLL in known locales paths. If it doesn't find it, it falls back to
  41   // looking for an en-US.dll.
  42   //
  43   // Returns true if a locale DLL can be found, false otherwise.
  44   bool GetLocaleFilePath(const std::wstring& locale, std::wstring* file_path);
  45
  46   // Loads the locale dll at the given path. Returns a handle to the DLL or
  47   // NULL on failure.
  48   HINSTANCE LoadLocaleDll(const std::wstring& dll_path);
  49
  50   // Returns the string resource identified by message_id from the currently
  51   // loaded locale dll.
  52   std::wstring GetLocalizedResource(int message_id);
  53
  54   friend struct DefaultSingletonTraits<SimpleResourceLoader>;
  55
  56   static HINSTANCE locale_dll_handle_;
  57 };
  58
  59 #endif  // CHROME_FRAME_SIMPLE_RESOURCE_LOADER_H_