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#ifndef MOZC_UNIX_IBUS_CANDIDATE_WINDOW_HANDLER_INTERFACE_H_
#define MOZC_UNIX_IBUS_CANDIDATE_WINDOW_HANDLER_INTERFACE_H_

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

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

class CandidateWindowHandlerInterface {
 public:
  CandidateWindowHandlerInterface() {}
  virtual ~CandidateWindowHandlerInterface() {}

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

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

  // Shows candidate window.
  virtual void Show(IBusEngine *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 string &custom_font_description) = 0;
  virtual void OnIBusUseCustomFontDescriptionChanged(
      bool use_custom_font_description) = 0;

 private:
  DISALLOW_COPY_AND_ASSIGN(CandidateWindowHandlerInterface);
};

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