Unity - AnimatedButtonScaleDownOnPress

using System.Collections;
using UnityEngine;
using UnityEngine.UI;
using UnityEngine.EventSystems;// Required when using Event data.

public class AnimatedButtonScaleDownOnPress : MonoBehaviour, IPointerUpHandler,IPointerDownHandler,IPointerEnterHandler,IPointerExitHandler {

    [SerializeField]
    Vector3 scaleDownSize = new Vector3 (0.9f,0.9f,1f); // The size when the button is pressed
    private Vector3 defaultScale; // This is the original size of the button

    [Space]

    [SerializeField]
    bool doColorTintOnPress = true; // default - tint the button on press

    [SerializeField]
    Color colorTint = new Color (0.7f, 0.7f, 0.7f, 1); // slight grey
    Color colorOriginal; // the original color of the button before pressed

    Image imageOfButton;
    private bool pressedButton;


    private bool movedPointerOffButtonAfterPress; // Keep track of button pressed but moved pointer away from button but held the pressed input

    // Use this for initialization
    void Start () {

        // Get the image component
        imageOfButton = GetComponent<Image> ();

        // Save the original button color
        colorOriginal = imageOfButton.color;

        // Save the original tranform scale
        defaultScale = transform.localScale;
    }

    #region Pointer Events

    public void OnPointerDown(PointerEventData eventData)
    {
        PressAnimation ();
    }

    public void OnPointerUp(PointerEventData eventData)
    {
        ResetAnimation ();

        // Button is no longer pressed - reset the bools
        movedPointerOffButtonAfterPress = false;
        pressedButton = false;
    }

    public void OnPointerEnter(PointerEventData eventData)
    {
        // Check if pressed the button, moved the pointer off the button but held the input
        // then moved back onto the button (redo the press animation)
        if (pressedButton == true && movedPointerOffButtonAfterPress == true)
        {
            PressAnimation ();
        }
    }

    public void OnPointerExit(PointerEventData eventData)
    {
        ResetAnimation ();
        movedPointerOffButtonAfterPress = true;
    }

    #endregion

    #region Button Animations

    public void PressAnimation()
    {
        // Set the button as pressed;
        pressedButton = true;

        // Change the color if needed
        if (doColorTintOnPress == true){
            imageOfButton.color = colorTint;
        }

        // Update the scale
        transform.localScale = scaleDownSize;
    }

    public void ResetAnimation()
    {
        // Reset the scale
        transform.localScale = defaultScale;

        // Reset the color
        if (doColorTintOnPress == true){
            imageOfButton.color = colorOriginal;
        }

    }

    #endregion

}