navigator.h

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//
// Copyright RIME Developers
// Distributed under the BSD License
//
// 2011-11-20 GONG Chen <chen.sst@gmail.com>
//
#ifndef RIME_NAVIGATOR_H_
#define RIME_NAVIGATOR_H_
 
#include <rime/common.h>
#include <rime/component.h>
#include <rime/processor.h>
#include <rime/gear/key_binding_processor.h>
#include <rime/gear/translator_commons.h>
 
namespace rime {
 
class Navigator : public Processor, public KeyBindingProcessor<Navigator, 2> {
 public:
  enum TextOrientation {
    Horizontal = 0,
    Vertical = 1,
  };
  enum SyllableJumpPosition {
    AfterDelimiter = 0,
    BeforeDelimiter = 1,
  };
 
  explicit Navigator(const Ticket& ticket);
  virtual ~Navigator();
 
  ProcessResult ProcessKeyEvent(const KeyEvent& key_event) override;
 
  Handler Rewind;
  Handler Forward;
  Handler LeftByChar;
  Handler RightByChar;
  Handler LeftBySyllable;
  Handler RightBySyllable;
  Handler Home;
  Handler End;
  Handler LeftByCharNoLoop;
  Handler RightByCharNoLoop;
  Handler LeftBySyllableNoLoop;
  Handler RightBySyllableNoLoop;
 
 private:
  void BeginMove(Context* ctx);
  bool JumpLeft(Context* ctx, size_t start_pos = 0, bool loop = false);
  bool JumpRight(Context* ctx, size_t start_pos = 0, bool loop = false);
  bool MoveLeft(Context* ctx);
  bool MoveRight(Context* ctx);
  bool GoHome(Context* ctx);
  bool GoToEnd(Context* ctx);
  void OnSelect(Context*);
 
  string input_;
  Spans spans_;
 
  connection select_connection_;
 
 private:
  string delimiters_;
  SyllableJumpPosition syllable_jump_position_ = AfterDelimiter;
  size_t ToSpanStart(size_t pos);
  size_t ToSpanEnd(size_t pos);
  size_t ToSyllableStart(size_t pos);
  size_t ToSyllableEnd(size_t pos);
  size_t SkipDelimiterBackward(size_t pos);
  size_t SkipDelimiterForward(size_t pos);
};
 
}  // namespace rime
 
#endif  // RIME_NAVIGATOR_H_