awesome-uiwidgets/AwesomeUIWidgets/Assets/Scripts/ChatPanelManager.cs

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

public class ChatPanelManager : MonoBehaviour
{

    public RectTransform transformPosition;
    public RectTransform transformedPosition;
    public RectTransform canvasPosition;
    public RectTransform imagePosition;
    public List<GameObject> OtherPanels;
    public Camera mainCamera;
    public GameObject button;
    private static bool isLerp = false;
    public static bool isOpenPanel = false;
    public float speed = 5.0f;
    private static bool isFirstTime = true;
    private bool wait = false;

    private void Start()
    {
        button.SetActive(true);
        canvasPosition.sizeDelta = new Vector2(UnityEngine.Screen.width,UnityEngine.Screen.height);
        transformedPosition.sizeDelta = new Vector2(UnityEngine.Screen.width,UnityEngine.Screen.height);
        transformPosition.sizeDelta = new Vector2(UnityEngine.Screen.width,UnityEngine.Screen.height);
        Vector3 transformedScale = transformedPosition.localScale;
        transformedPosition.localScale = new Vector3(
            transformedScale.x * 1920 / UnityEngine.Screen.height,
            transformedScale.y * 1920 / UnityEngine.Screen.height, 
            z:transformedScale.z
            );
    }

    void Update()
    {

        if (isLerp)
        {
            
            if (isOpenPanel)
            {
                canvasPosition.anchoredPosition3D = Vector3.Lerp(canvasPosition.anchoredPosition3D,
                    transformedPosition.anchoredPosition3D, speed * Time.deltaTime);
                canvasPosition.localRotation = Quaternion.Lerp(canvasPosition.localRotation,
                    transformedPosition.localRotation, speed * Time.deltaTime);
                canvasPosition.localScale = Vector3.Lerp(canvasPosition.localScale, transformedPosition.localScale,
                    speed * Time.deltaTime);
                if(Vector3.Distance(canvasPosition.anchoredPosition3D,transformedPosition.anchoredPosition3D) < 0.1f)
                {
                    isLerp = false;
                    canvasPosition.GetComponent<Canvas>().renderMode = RenderMode.ScreenSpaceOverlay;
                    imagePosition.sizeDelta = new Vector2(UnityEngine.Screen.width,UnityEngine.Screen.height);
                    imagePosition.offsetMin = new Vector2(0, 0);
                    imagePosition.offsetMax = new Vector2(0, 0);
                    foreach (var panel in OtherPanels)
                    {
                        panel.SetActive(false);
                    }
                }
                button.SetActive(false);
            }
            else
            {
                if (isFirstTime)
                {
                    canvasPosition.GetComponent<Canvas>().renderMode = RenderMode.WorldSpace;
                    canvasPosition.GetComponent<Canvas>().worldCamera = mainCamera;
                    canvasPosition.anchoredPosition3D = transformedPosition.anchoredPosition3D;
                    canvasPosition.localRotation = transformedPosition.localRotation;
                    canvasPosition.localScale = transformedPosition.localScale;
                    foreach (var panel in OtherPanels)
                    {
                        panel.SetActive(true);
                    }
                    isFirstTime = false;
                    wait = true;
                    button.SetActive(true);
                    StartCoroutine(SkipForAWhile());
                }
                
                if (!wait)
                {
                    canvasPosition.anchoredPosition3D = Vector3.Lerp(canvasPosition.anchoredPosition3D,
                        transformPosition.anchoredPosition3D, speed * Time.deltaTime);
                    canvasPosition.localRotation = Quaternion.Lerp(canvasPosition.localRotation,
                        transformPosition.localRotation, speed * Time.deltaTime);
                    canvasPosition.localScale = Vector3.Lerp(canvasPosition.localScale, transformPosition.localScale,
                        speed * Time.deltaTime);
                    if(Vector3.Distance(canvasPosition.anchoredPosition3D, transformedPosition.anchoredPosition3D)<0.1f)
                    {
                        isLerp = false;
                    }
                }
            }
        }
    }

    IEnumerator SkipForAWhile()
    {
        yield return new WaitForSeconds(0.15f);
        wait = false;
    }

    public static void Switch()
    {
        isLerp = true;
        isOpenPanel = !isOpenPanel;
        isFirstTime = true;
    }

    public void SwitchB()
    {
        Switch();
    }

}