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#ifndef MOZC_UNIX_IBUS_CANDIDATE_WINDOW_HANDLER_INTERFACE_H_
#define MOZC_UNIX_IBUS_CANDIDATE_WINDOW_HANDLER_INTERFACE_H_

#include <string>

#include "base/port.h"
#include "unix/ibus/ibus_wrapper.h"

namespace mozc {
namespace commands {
class Output;
}  // namespace commands
namespace ibus {

class CandidateWindowHandlerInterface {
 public:
  CandidateWindowHandlerInterface() {}
  CandidateWindowHandlerInterface(const CandidateWindowHandlerInterface &) =
      delete;
  CandidateWindowHandlerInterface &operator=(
      const CandidateWindowHandlerInterface &) = delete;
  virtual ~CandidateWindowHandlerInterface() {}

  // Updates candidate state. This function also shows or hides candidate window
  // based on output argument.
  virtual void Update(IbusEngineWrapper *engine,
                      const commands::Output &output) = 0;

  // Updates candidate state. This function also shows or hides candidate window
  // based on the last |Update| call.
  virtual void UpdateCursorRect(IbusEngineWrapper *engine) = 0;

  // Hides candidate window.
  virtual void Hide(IbusEngineWrapper *engine) = 0;

  // Shows candidate window.
  virtual void Show(IbusEngineWrapper *engine) = 0;

  // Following methods handle property-changed events relevant to ibus-panel.
  // |custom_font_description| should be a string representation of
  // PangoFontDescription.
  // http://developer.gnome.org/pango/stable/pango-Fonts.html#pango-font-description-from-string
  virtual void OnIBusCustomFontDescriptionChanged(
      const std::string &custom_font_description) = 0;
  virtual void OnIBusUseCustomFontDescriptionChanged(
      bool use_custom_font_description) = 0;
};

}  // namespace ibus
}  // namespace mozc
#endif  // MOZC_UNIX_IBUS_CANDIDATE_WINDOW_HANDLER_INTERFACE_H_
