同步

Packages/dev.yarnspinner.unity/Runtime/Views/Effects.cs

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+/*
+Yarn Spinner is licensed to you under the terms found in the file LICENSE.md.
+*/
+
+using System;
+using System.Collections;
+using UnityEngine;
+using System.Collections.Generic;
+
+#if USE_TMP
+using TMPro;
+#else
+using TextMeshProUGUI = Yarn.Unity.TMPShim;
+#endif
+
+using System.Threading;
+
+#nullable enable
+
+namespace Yarn.Unity
+{
+    public static class Effects
+    {
+        public static IEnumerator FadeAlpha(CanvasGroup canvas, float from, float to, float duration, CancellationToken token)
+        {
+            return YarnTask.ToCoroutine(() => FadeAlphaAsync(canvas, from, to, duration, token));
+        }
+
+        public static async YarnTask FadeAlphaAsync(CanvasGroup canvas, float from, float to, float duration, CancellationToken token)
+        {
+            if (duration == 0)
+            {
+                canvas.alpha = to;
+                return;
+            }
+
+            canvas.alpha = from;
+
+            float accumulator = 0;
+            while (!token.IsCancellationRequested && accumulator < duration)
+            {
+                accumulator += Time.deltaTime;
+                canvas.alpha = Mathf.Lerp(from, to, accumulator / duration);
+                await YarnTask.Yield();
+            }
+
+            canvas.alpha = to;
+        }
+    }
+}