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#ifndef MOZC_WIN32_TIP_TIP_TRANSITORY_EXTENSION_H_
#define MOZC_WIN32_TIP_TIP_TRANSITORY_EXTENSION_H_

#include <msctf.h>
#include <wil/com.h>
#include <windows.h>

namespace mozc {
namespace win32 {
namespace tsf {

// This class provides utility methods to access parent object provided by
// Transitory Extensions.
// Starting with Windows Vista, CUAS provides Transitory Extensions with which
// full text store support is available for edit control, rich edit control,
// and Trident edit control. You can use these text stores mainly for one-shot
// read/read-write access. For keyboard input, which may require text
// composition, should use the original (transitory) text store.
// See the following article for the details about Transitory Extensions.
// http://blogs.msdn.com/b/tsfaware/archive/2007/05/21/transitory-extensions.aspx
class TipTransitoryExtension {
 public:
  TipTransitoryExtension() = delete;
  TipTransitoryExtension(const TipTransitoryExtension &) = delete;
  TipTransitoryExtension &operator=(const TipTransitoryExtension &) = delete;

  // Returns the parent (full-text-store) document manager if exists.
  // Returns |document_manager| otherwise.
  static wil::com_ptr_nothrow<ITfDocumentMgr> ToParentDocumentIfExists(
      ITfDocumentMgr *document_manager);

  // Returns the parent (full-text-store) context if exists.
  // Returns |context| otherwise.
  static wil::com_ptr_nothrow<ITfContext> ToParentContextIfExists(
      ITfContext *context);
};

}  // namespace tsf
}  // namespace win32
}  // namespace mozc

#endif  // MOZC_WIN32_TIP_TIP_TRANSITORY_EXTENSION_H_
