Adventures-of-Kirby/Assets/_Project/Scripts/UI/DialogueUI.cs

using UnityEngine;
using UnityEngine.UI;

namespace KirbyAdventures
{
    public class DialogueUI : MonoBehaviour
    {
        public static DialogueUI Instance { get; private set; }

        Text _text;
        Image _panel;
        float _hideAt;

        public static DialogueUI EnsureExists()
        {
            if (Instance != null) return Instance;
            var go = new GameObject("DialogueUI");
            DontDestroyOnLoad(go);
            return go.AddComponent<DialogueUI>();
        }

        void Awake()
        {
            Instance = this;
            Build();
        }

        void Build()
        {
            var canvas = gameObject.AddComponent<Canvas>();
            canvas.renderMode = RenderMode.ScreenSpaceOverlay;
            canvas.sortingOrder = 50;
            gameObject.AddComponent<CanvasScaler>().uiScaleMode = CanvasScaler.ScaleMode.ScaleWithScreenSize;
            gameObject.AddComponent<GraphicRaycaster>();

            var panelGo = new GameObject("Panel");
            panelGo.transform.SetParent(transform, false);
            _panel = panelGo.AddComponent<Image>();
            _panel.color = new Color(0.05f, 0.07f, 0.1f, 0.82f);
            var prt = _panel.rectTransform;
            prt.anchorMin = new Vector2(0.12f, 0.05f);
            prt.anchorMax = new Vector2(0.88f, 0.22f);
            prt.offsetMin = Vector2.zero;
            prt.offsetMax = Vector2.zero;

            var textGo = new GameObject("Quote");
            textGo.transform.SetParent(panelGo.transform, false);
            _text = textGo.AddComponent<Text>();
            _text.font = Resources.GetBuiltinResource<Font>("LegacyRuntime.ttf");
            if (_text.font == null)
                _text.font = Resources.GetBuiltinResource<Font>("Arial.ttf");
            _text.fontSize = 26;
            _text.alignment = TextAnchor.MiddleCenter;
            _text.color = new Color(0.95f, 0.93f, 0.88f);
            _text.horizontalOverflow = HorizontalWrapMode.Wrap;
            _text.verticalOverflow = VerticalWrapMode.Overflow;
            var trt = _text.rectTransform;
            trt.anchorMin = new Vector2(0.04f, 0.1f);
            trt.anchorMax = new Vector2(0.96f, 0.9f);
            trt.offsetMin = Vector2.zero;
            trt.offsetMax = Vector2.zero;

            _panel.gameObject.SetActive(false);
        }

        public static void ShowTemporary(string quote, float seconds)
        {
            EnsureExists();
            Instance.Show(quote, seconds);
        }

        public void Show(string quote, float seconds)
        {
            if (_text == null) return;
            _text.text = quote;
            _panel.gameObject.SetActive(true);
            _hideAt = Time.unscaledTime + seconds;
        }

        void Update()
        {
            if (_panel != null && _panel.gameObject.activeSelf && Time.unscaledTime >= _hideAt)
                _panel.gameObject.SetActive(false);
        }
    }
}