Flow Layout

Assets/GWConquest/Scripts/UI/FlowLayout.cs

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+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+using UnityEngine.UI;
+
+
+namespace GWConquest {
+    public class FlowLayout : LayoutGroup
+    {
+
+        public Vector2 Spacing;
+
+        float SetLayoutAlongAxis(int axis)
+        {
+
+            var size = rectTransform.rect.size;
+
+            float currentX = padding.left;
+            float currentY = padding.top;
+
+            float currentLineHeight = 0f;
+
+            for(int i = 0; i < rectChildren.Count; i++)
+            {
+                var child = rectChildren[i];
+                var childSize = child.sizeDelta;
+
+                if(currentX + childSize.x > size.x - padding.right)
+                {
+                    currentX = padding.left;
+                    currentY += currentLineHeight + Spacing.y;
+                    currentLineHeight = 0f;
+                }
+
+                if(axis == 0)
+                {
+                    SetChildAlongAxis(child, 0, currentX);
+                }
+                else if(axis == 1){
+                    SetChildAlongAxis(child, 1, currentY);
+                }
+
+                currentX += childSize.x + Spacing.x;
+                currentLineHeight = Mathf.Max(currentLineHeight, childSize.y);
+                            
+            }
+
+            return currentY + currentLineHeight + padding.bottom;
+        }
+
+        public override void SetLayoutHorizontal()
+        {
+            SetLayoutAlongAxis(0);
+        }
+
+        public override void SetLayoutVertical()
+        {
+            SetLayoutAlongAxis(1);
+        }
+
+        void CalcAlongAxis(int axis)
+        {
+            float totalMin = 0f;
+            float totalPreferred = 0f;
+
+            for(int i = 0; i < rectChildren.Count; i++)
+            {
+                RectTransform child = rectChildren[i];
+                float childSize = child.sizeDelta[axis];
+                totalMin = Mathf.Max(totalMin, childSize);
+                totalPreferred += childSize + Spacing[axis];
+            }
+
+            if(rectChildren.Count > 0)
+            {
+                totalPreferred -= Spacing[axis];
+            }
+
+            if(axis==1)
+            {
+                totalPreferred = Mathf.Min(totalPreferred, SetLayoutAlongAxis(-1));
+            }
+
+            SetLayoutInputForAxis(totalMin, totalPreferred, 1f, axis);
+        }
+
+        public override void CalculateLayoutInputHorizontal()
+        {
+            base.CalculateLayoutInputHorizontal();
+
+            CalcAlongAxis(0);
+        }
+
+        public override void CalculateLayoutInputVertical()
+        {
+            CalcAlongAxis(1);
+        }
+
+    }
+}

Assets/GWConquest/Scripts/UI/FlowLayout.cs.meta

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