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Assets/Plugins/SerializedCollections/Editor/Scripts/PagingElement.cs

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+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+using UnityEditor;
+
+namespace AYellowpaper.SerializedCollections.Editor
+{
+    public class PagingElement
+    {
+        public int Page
+        {
+            get => _page;
+            set
+            {
+                _page = value;
+                EnsureValidPageIndex();
+            }
+        }
+        public int PageCount
+        {
+            get => _pageCount;
+            set
+            {
+                Debug.Assert(value >= 1, $"{nameof(PageCount)} needs to be 1 or larger but is {value}.");
+                _pageCount = value;
+                EnsureValidPageIndex();
+            }
+        }
+
+        private const int buttonWidth = 20;
+        private const int inputWidth = 20;
+        private const int labelWidth = 30;
+
+        private int _page = 1;
+        private int _pageCount = 1;
+
+        public PagingElement(int pageCount = 1)
+        {
+            PageCount = pageCount;
+        }
+
+        public float GetDesiredWidth()
+        {
+            return buttonWidth * 2 + inputWidth + labelWidth;
+        }
+
+        public void OnGUI(Rect rect)
+        {
+            Rect leftButton = rect.WithXAndWidth(rect.x, buttonWidth);
+            Rect inputRect = leftButton.AppendRight(inputWidth);
+            Rect labelRect = inputRect.AppendRight(labelWidth);
+            Rect rightButton = labelRect.AppendRight(buttonWidth);
+            using (new GUIEnabledScope(Page != 1))
+                if (GUI.Button(leftButton, "<"))
+                    Page--;
+            using (new GUIEnabledScope(Page != PageCount))
+                if (GUI.Button(rightButton, ">"))
+                    Page++;
+            Page = EditorGUI.IntField(inputRect, Page);
+            GUI.Label(labelRect, "/" + PageCount.ToString());
+        }
+        
+        private void EnsureValidPageIndex()
+        {
+            _page = Mathf.Clamp(_page, 1, PageCount);
+        }
+    }
+}