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#ifndef MOZC_GUI_CHARACTER_PAD_HAND_WRITING_CANVAS_H_
#define MOZC_GUI_CHARACTER_PAD_HAND_WRITING_CANVAS_H_

#include <QtWidgets/QWidget>
#include <QtCore/QVector>
#include <QtCore/QPair>

#include "gui/character_pad/hand_writing_thread.h"
#include "handwriting/handwriting_manager.h"

class QMouseEvent;
class QListWidget;

namespace mozc {
namespace gui {

class HandWritingCanvas : public QWidget {
  Q_OBJECT;

 public:
  explicit HandWritingCanvas(QWidget *parent);
  virtual ~HandWritingCanvas();

  void setListWidget(QListWidget *list_widget);

  size_t strokes_size() const;

 public slots:
  void clear();
  void revert();
  void listUpdated();
  void restartRecognition();
  void statusUpdated(mozc::handwriting::HandwritingStatus status);

 protected:
  void paintEvent(QPaintEvent *event);
  void mousePressEvent(QMouseEvent *event);
  void mouseReleaseEvent(QMouseEvent *event);
  void mouseMoveEvent(QMouseEvent *event);

 private:
  void recognize();
  handwriting::Strokes strokes_;
  QListWidget *list_widget_;
  bool is_drawing_;
  HandWritingThread recognizer_thread_;
  handwriting::HandwritingStatus handwriting_status_;

 signals:
  void startRecognition();
  void canvasUpdated();
};
}  // namespace gui
}  // namespace mozc

using mozc::gui::HandWritingCanvas;

#endif  // MOZC_GUI_CHARACTER_PAD_HAND_WRITING_CANVAS_H_