ToastModule.cs

using System.Collections.Generic;
using UnityEngine;

namespace HTFToolkit
{
    /// <summary>
    /// 开关提示：屏幕上方居中的淡出通知（"准星: 开启"）。
    /// </summary>
    internal static class ToastModule
    {
        private struct Toast
        {
            public string Text;
            public Color Color;
            public double Expire;
        }

        private static readonly List<Toast> _toasts = new List<Toast>();
        private static GUIStyle _style;
        private static GUIStyle _shadowStyle;

        private const double Lifetime = 1.6;
        private const double FadeTime = 0.4;

        public static void Show(string moduleName, bool on)
        {
            Show(moduleName + ": " + (on ? "<color=#5dff5d>开启</color>" : "<color=#ff5d5d>关闭</color>"),
                 on ? new Color(1f, 1f, 1f) : new Color(1f, 0.85f, 0.85f));
        }

        public static void Show(string text, Color color)
        {
            _toasts.Add(new Toast
            {
                Text = text,
                Color = color,
                Expire = Time.realtimeSinceStartupAsDouble + Lifetime
            });
            if (_toasts.Count > 5)
                _toasts.RemoveAt(0);
        }

        public static void Draw()
        {
            if (_toasts.Count == 0 || Event.current == null)
                return;

            if (_style == null)
            {
                _style = new GUIStyle(GUI.skin.label)
                {
                    fontStyle = FontStyle.Bold,
                    alignment = TextAnchor.MiddleCenter,
                    richText = true
                };
                _shadowStyle = new GUIStyle(_style);
            }
            _style.fontSize = UIScale.TitleFont;
            _shadowStyle.fontSize = UIScale.TitleFont;

            double now = Time.realtimeSinceStartupAsDouble;
            float y = 46f;
            for (int i = _toasts.Count - 1; i >= 0; i--)
            {
                if (now > _toasts[i].Expire)
                {
                    _toasts.RemoveAt(i);
                    continue;
                }
            }

            for (int i = 0; i < _toasts.Count; i++)
            {
                Toast t = _toasts[i];
                double remain = t.Expire - now;
                float alpha = remain < FadeTime ? (float)(remain / FadeTime) : 1f;

                Color c = t.Color;
                c.a = alpha;

                // 框高/行距按字号自适应（固定 26px 在大字号下会截断文字）
                float lineH = _style.fontSize * 1.4f;
                Rect r = new Rect(0f, y, Screen.width, lineH);
                _shadowStyle.normal.textColor = new Color(0f, 0f, 0f, alpha);
                _style.normal.textColor = c;

                GUI.Label(new Rect(r.x + 1f, r.y + 1f, r.width, r.height), t.Text, _shadowStyle);
                GUI.Label(r, t.Text, _style);

                y += lineH + _style.fontSize * 0.25f;
            }
        }
    }
}