hold_items

using UnityEngine; 
using System.Collections;

public class HoldItems : MonoBehaviour {       
  public float speed = 10;     
  public bool canHold = true;     
  public GameObject ball;     
  public Transform guide;    
  
  void Update()   
  {       
    if (Input.GetMouseButtonDown(0))       
    {           
      if (!canHold)               
        throw_drop();           
      else               
        Pickup();       
    }//mause If         
    
    if (!canHold && ball)           
      ball.transform.position = guide.position;          
  
  }//update      
  
  //We can use trigger or Collision     
  void OnTriggerEnter(Collider col)     
  {         
    if (col.gameObject.tag == "ball")             
      if (!ball) // if we don't have anything holding                 
        ball = col.gameObject;     
  }      
  
  //We can use trigger or Collision     
  void OnTriggerExit(Collider col)     
  {         
    if (col.gameObject.tag == "ball")         
    {             
      if (canHold)                 
        ball = null;         
    }     
  }       
  
  private void Pickup()     
  {         
    if (!ball)             
      return;          
    //We set the object parent to our guide empty object.         
    ball.transform.SetParent(guide);          
    //Set gravity to false while holding it         
    ball.GetComponent<Rigidbody>().useGravity = false;          
    //we apply the same rotation our main object (Camera) has.        
    ball.transform.localRotation = transform.rotation;        
    //We re-position the ball on our guide object          
    ball.transform.position = guide.position;          
    canHold = false;     
  }      
  
  private void throw_drop()     
  {         
    if (!ball)             
      return;          
    
    //Set our Gravity to true again.         
    ball.GetComponent<Rigidbody>().useGravity = true;          
    // we don't have anything to do with our ball field anymore          
    ball = null;          
    //Apply velocity on throwing         
    guide.GetChild(0).gameObject.GetComponent<Rigidbody>().velocity = transform.forward * speed; 
    //Unparent our ball         
    guide.GetChild(0).parent = null;         
    canHold = true;     } 
}//class