Twitchue/Assets/Scripts/UI/Resizable.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public enum AnimationType
{
    EaseInOut,
    Ease,
    Lerp,
    SlowThenFast
}

[RequireComponent(typeof(RectTransform))]
public class Resizable : MonoBehaviour
{
    RectTransform RectTransform;
    [SerializeField] private Vector2 Minimum;
    [SerializeField] private Vector2 Maximum;
    private bool IsStretched;

    private void Awake()
    {
        RectTransform = GetComponent<RectTransform>();
        IsStretched = RectTransform.rect.width > Minimum.x;
    }

    IEnumerator Lerp(bool toMaximum, AnimationType animation, float time)
    {
        float t = 0;
        float originalWidth = RectTransform.rect.width;
        float originalHeight = RectTransform.rect.height;
        while (t <= time)
        {
            switch(animation)
            {
                case AnimationType.Lerp:
                    {
                        if(toMaximum)
                        {
                            RectTransform.SetSizeWithCurrentAnchors(RectTransform.Axis.Horizontal, Mathf.Lerp(originalWidth, Maximum.x, t));
                            if(Maximum.y != -1)
                            {
                                RectTransform.SetSizeWithCurrentAnchors(RectTransform.Axis.Vertical, Mathf.Lerp(originalHeight, Maximum.y, t));
                            }
                        }
                        else
                        {
                            RectTransform.SetSizeWithCurrentAnchors(RectTransform.Axis.Horizontal, Mathf.Lerp(originalWidth, Minimum.x, t));
                            if (Minimum.y != -1)
                            {
                                RectTransform.SetSizeWithCurrentAnchors(RectTransform.Axis.Vertical, Mathf.Lerp(originalHeight, Minimum.y, t));
                            }
                        }
                    }
                    break;
            }
            t += Time.deltaTime;
            yield return null;
        }

        StopCoroutine(Lerp(toMaximum, animation, time));
    }

    public void Stretch(AnimationType animation = AnimationType.Lerp, float time = 5)
        => StartCoroutine(Lerp(true, animation, time));

    public void Shrink(AnimationType animation = AnimationType.Lerp, float time = 5)
        => StartCoroutine(Lerp(false, animation, time));

    public void Toggle()
    {
        if(IsStretched)
        {
            Shrink();

            IsStretched = false;
        }
        else
        {
            Stretch();

            IsStretched = true;
        }
    }
}