///////////////////////////////////////////////////////////////////////////
//
//		Realistic rain real-time simulation program
//
//		Pierre Rousseau
//
///////////////////////////////////////////////////////////////////////////
//
//		Main camera, and external events (mouse/keyboard) handling
//
///////////////////////////////////////////////////////////////////////////



#ifndef __RAIN_FRAME_LISTENER__
#define __RAIN_FRAME_LISTENER__

#include "CommonRain.h"
#include "RainCloseDropsParticles.h"
#include <ExampleFrameListener.h>




/** RainFrameListener class
  * processes keyboard and mouse events,
  * and performs all computations needed for each frame
  */
class RainFrameListener : public ExampleFrameListener
{
private:

    SceneNode *mViewNode, *mCameraNode;
    Real timer;
    CloseDropsParticles *mRainSystem;

public:

    /**
     ** standard constructor
     **  - the renderWindow and camera are needed for reglar initialization of the frame listener
     **  - view node will only be translated (position of the observer and particle system)
     **  - cameranode, which must be attached to viewNode, will be rotated to look in any direction
     **  - syst is the particle system itself, which will need to be updated with user input, time since last frame...
     */
    RainFrameListener(RenderWindow* win, Camera* cam, SceneNode* ViewNode, SceneNode* CameraNode, CloseDropsParticles *syst);

    /**
     ** this function is called just before a frame gets rendered 
     ** Contains reactions to user input (keyboard, mouse), and calls for particle system update
     */
    bool frameStarted(const FrameEvent& evt);

    /**
     ** this function is called just after a frame gets rendered
     */
    bool frameEnded(const FrameEvent& evt);

protected:
    /**
     ** function to update the text of the overlay with fps stats
     */
    void updateStats(void);

    /**
     ** function to set a specific text on the stats overlay
     */
    void displayMessage(String text);
};




#endif //__RAIN_FRAME_LISTENER__