src/unix/ibus/key_translator.h

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#ifndef MOZC_UNIX_IBUS_KEY_TRANSLATOR_H_
#define MOZC_UNIX_IBUS_KEY_TRANSLATOR_H_

#include <map>

#include "base/port.h"
#include "session/commands.pb.h"
#include "unix/ibus/ibus_header.h"

namespace mozc {
namespace ibus {

// This class is responsible for converting key code sent from ibus-daemon
// (defined in /usr/include/ibus-1.0/ibuskeysyms.h) to a KeyEvent object for
// the input of session_interface.
class KeyTranslator {
 public:
  KeyTranslator();
  virtual ~KeyTranslator();

  // Converts ibus keycode to Mozc key code and stores them on |out_event|.
  // Returns true if ibus keycode is successfully converted to Mozc key code.
  bool Translate(guint keyval,
                 guint keycode,
                 guint modifiers,
                 config::Config::PreeditMethod method,
                 bool layout_is_jp,
                 commands::KeyEvent *out_event) const;

 private:
  typedef map<guint, commands::KeyEvent::SpecialKey> SpecialKeyMap;
  typedef map<guint, commands::KeyEvent::ModifierKey> ModifierKeyMap;
  typedef map<guint, pair<string, string> > KanaMap;

  // Returns true iff key is modifier key such as SHIFT, ALT, or CAPSLOCK.
  bool IsModifierKey(guint keyval,
                     guint keycode,
                     guint modifiers) const;

  // Returns true iff key is special key such as ENTER, ESC, or PAGE_UP.
  bool IsSpecialKey(guint keyval,
                    guint keycode,
                    guint modifiers) const;

  // Returns true iff |keyval| is a key with a kana assigned.
  bool IsKanaAvailable(guint keyval,
                       guint keycode,
                       guint modifiers,
                       bool layout_is_jp,
                       string *out) const;

  // Returns true iff key is ASCII such as '0', 'A', or '!'.
  static bool IsAscii(guint keyval,
                      guint keycode,
                      guint modifiers);

  // Returns true iff key is printable.
  static bool IsPrintable(guint keyval, guint keycode, guint modifiers);

  // Returns true iff key is HiraganaKatakana with shift modifier.
  static bool IsHiraganaKatakanaKeyWithShift(guint keyval,
                                             guint keycode,
                                             guint modifiers);

  // Initializes private fields.
  void Init();

  // Stores a mapping from ibus keys to Mozc's special keys.
  SpecialKeyMap special_key_map_;
  // Stores a mapping from ibus modifier keys to Mozc's modifier keys.
  ModifierKeyMap modifier_key_map_;
  // Stores a mapping from ibus modifier masks to Mozc's modifier keys.
  ModifierKeyMap modifier_mask_map_;
  // Stores a mapping from ASCII to Kana character. For example, ASCII character
  // '4' is mapped to Japanese 'Hiragana Letter U' (without Shift modifier) and
  // 'Hiragana Letter Small U' (with Shift modifier).
  KanaMap kana_map_jp_;  // mapping for JP keyboard.
  KanaMap kana_map_us_;  // mapping for US keyboard.

  DISALLOW_COPY_AND_ASSIGN(KeyTranslator);
};

}  // namespace ibus
}  // namespace mozc

#endif  // MOZC_UNIX_IBUS_KEY_TRANSLATOR_H_