Animation looping question

In an FPS game I'm making, I set up an animation for gun-bob, and a script that enables the animation while walking forward (Holding 'W'). I've tried setting the animation's Wrap-Mode to Once or Loop.

If I set it to 'Once', the animation goes 1 loop and stops until I press 'W' again. (not what I want).

If I set Wrap-Mode to Loop, the animation loops infinitely even when releasing 'W'. (also not what i want!)

Here's my code:

Code (CSharp):

1. using UnityEngine;
2. using System.Collections;
3.  
4. public class WalkingMovement : MonoBehaviour {
5.     // Use this for initialization
6.     void Start () {
7.     }
8.  
9.     // Update is called once per frame
10.     void Update () {
11.     if (Input.GetKeyDown (KeyCode.W)) {
12.             gameObject.GetComponent<Animation> ().Play ("WalkAnimation");
13.         }
14.     }
15. }
16.  

Also, if it's useful, here is my animation in the Debug window...

 

...Solved the problem. After setting Wrap-Mode to Loop. The solution was to use GetKey() and not GetKeyDown()

Also needed to add an Else-block and a Stop() call...

Working code...

Code (CSharp):

1. using UnityEngine;
2. using System.Collections;
3.  
4. public class WalkingMovement : MonoBehaviour
5. {
6.     // Use this for initialization
7.     void Start ()
8.     {
9.     }
10.  
11.     // Update is called once per frame
12.     void Update ()
13.     {
14.         if (Input.GetKey (KeyCode.W)) {
15.             //gameObject.GetComponent<Animation> ().wrapMode = WrapMode.Loop;
16.             gameObject.GetComponent<Animation> ().Play ("WalkAnimation");
17.         } else {
18.             gameObject.GetComponent<Animation> ().Stop ("WalkAnimation");
19.         }
20.     }
21. }
22.