alpha modifier

Author: Dimonik333

Assets/CatCode.meta

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+using UnityEngine;
+
+namespace CatCode.AlphaModifiers
+{
+    public sealed class CanvasGroupAlphaModifierStrategy : IAlphaModifierStrategy
+    {
+        [SerializeField] private CanvasGroup _canvasGroup;
+        [SerializeField] private float _alpha;
+
+        public CanvasGroupAlphaModifierStrategy(CanvasGroup canvasGroup)
+        {
+            _canvasGroup = canvasGroup;
+            _alpha = _canvasGroup.alpha;
+        }
+
+        public void SetAlpha(float value)
+        {
+            var alpha = Mathf.Clamp01(_alpha * value);
+            _canvasGroup.alpha = alpha;
+        }
+    }
+}

Assets/CatCode/AlphaModifiers.meta

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+using UnityEngine;
+
+namespace CatCode.AlphaModifiers
+{
+    public static class GradientUtils
+    {
+        public static void UpdateAlphaKeys(Gradient gradient, GradientAlphaKey[] defaultAlphaKeys, float alpha)
+        {
+            var alphaKeys = gradient.alphaKeys;
+            var length = Mathf.Min(alphaKeys.Length, defaultAlphaKeys.Length);
+
+            for (int i = 0; i < length; i++)
+            {
+                ref var alphaKey = ref alphaKeys[i];
+                alphaKey.alpha = defaultAlphaKeys[i].alpha * alpha;
+            }
+
+            gradient.alphaKeys = alphaKeys;
+        }
+    }
+}

Assets/CatCode/AlphaModifiers/AlphaModifierStrategies.meta

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+using System;
+using UnityEngine;
+using UnityEngine.UI;
+
+namespace CatCode.AlphaModifiers
+{
+    [Serializable]
+    public class GraphicAlphaModifierStrategy : IAlphaModifierStrategy
+    {
+        [Serializable]
+        public struct AlphaGraphicData
+        {
+            public float alpha;
+            public Graphic graphic;
+
+
+            public AlphaGraphicData(float alpha, Graphic graphic)
+            {
+                this.alpha = alpha;
+                this.graphic = graphic;
+            }
+        }
+
+
+        [SerializeField] private AlphaGraphicData[] _graphics;
+
+        public GraphicAlphaModifierStrategy(Graphic graphic) : this(new Graphic[] { graphic })
+        { }
+
+        public GraphicAlphaModifierStrategy(Graphic[] graphics)
+        {
+            _graphics = new AlphaGraphicData[graphics.Length];
+            for (int i = 0; i < _graphics.Length; i++)
+                _graphics[i] = new AlphaGraphicData(graphics[i].color.a, graphics[i]);
+        }
+
+        public void Initialize()
+        {
+        }
+
+        public void SetAlpha(float value)
+        {
+            for (int i = 0; i < _graphics.Length; i++)
+            {
+                var graphicData = _graphics[i];
+                var alpha = Mathf.Clamp(graphicData.alpha * value, 0f, 1f);
+
+                var color = graphicData.graphic.color;
+                color.a = alpha;
+                graphicData.graphic.color = color;
+            }
+        }
+    }
+}

Assets/CatCode/AlphaModifiers/AlphaModifierStrategies/CanvasGroupAlphaModifierStrategy.cs

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+namespace CatCode.AlphaModifiers
+{
+    public interface IAlphaModifierStrategy
+    {
+        void SetAlpha(float value);
+    }
+}