text: #ifndef __SAMPLE_GRAY_SCALE_SCENE_H__
  #define __SAMPLE_GRAY_SCALE_SCENE_H__
  
  #include "SampleBaseScene.h"
  
  class SampleGrayScaleScene : public SampleBaseScene
  {
  public:
      CREATE_SCENE_FUNC(SampleGrayScaleScene);
      CREATE_FUNC(SampleGrayScaleScene);
      bool init() override;
      
  private:
      void backCallback(cocos2d::Ref* pSender) override;
      void nextCallback(cocos2d::Ref* pSender) override;
  };
  
  #endif // __SAMPLE_GRAY_SCALE_SCENE_H__
  