Unity editor expansion - scrolling list

Scroll through the list

• Do not engage in the pull-down loading of the mobile terminal , Pull up to refresh
• Use paging and page skipping to display list data
• This article provides a custom scrolling list with page turning function

design sketch

To construct a scrolling list API

// The following need to appear in pairs 
GUILayout.BeginScrollView
GUILayout.EndScrollView

GUILayout.BeginVertical
GUILayout.EndVertical

GUILayout.BeginHorizontal
GUILayout.EndHorizontal

//Unity The scrolling list of the editor is to place a vertical or horizontal layout component containing content in the middle of the scrolling view 

Code

using System;
using System.Collections.Generic;
using UnityEditor;
using UnityEngine;

namespace DC.DCIMGUIBox
{
    public struct ListViewUserData
    {
        public Vector2 pos;
        public int pageIndex;
        public int onePageCnt;
        public int newPageIndex;

        public ListViewUserData(Vector2 pos, int pageIndex, int onePageCnt, int newPageIndex)
        {
            this.pos = pos;
            this.pageIndex = pageIndex;
            this.onePageCnt = onePageCnt;
            this.newPageIndex = newPageIndex;
        }
    }

    public class ScrollWindow_03 : EditorWindow
    {
        [MenuItem("DC/IMGUI/ScrollWindow_03")]
        public static void Open()
        {
            var window = GetWindow<ScrollWindow_03>();
            window.minSize = new Vector2(800, 600);
        }

        List<int> dataListA = new List<int>();

        private ListViewUserData listInfo = new ListViewUserData(Vector2.zero, 0, 20, 0);

        void OnGUI()
        {
            if (dataListA.Count == 0)
            {
                for (int i = 0; i < 100; i++)
                {
                    dataListA.Add(i);
                }
            }

            listInfo = ScrollList(listInfo, true, dataListA, Render,
                new GUILayoutOption[] {GUILayout.Width(200), GUILayout.Height(200)},
                new GUILayoutOption[] { });
        }

        public void Render<T>(int index, T data)
        {
            GUILayout.Label(string.Format("id：{0} name：{1}", index, index));
        }

        public ListViewUserData ScrollList<T>(ListViewUserData listInfo, bool vertical, List<T> dataList,
            Action<int, T> renderFunc, GUILayoutOption[] svLp, GUILayoutOption[] containerLp)
        {
            var startIndex = listInfo.pageIndex * listInfo.onePageCnt;
            if (startIndex < 0)
            {
                return listInfo;
            }

            if (dataList.Count == 0)
            {
                GUILayout.Label("dataList is empty!  An empty list ");
                return listInfo;
            }

            if (startIndex > dataList.Count)
            {
                GUILayout.Label("page index is too big!  The maximum number of pages is exceeded ");
                return listInfo;
            }

            // Header 
            GUILayout.BeginHorizontal();

            EditorGUILayout.LabelField(" Page number ", GUILayout.Width(30));

            listInfo.newPageIndex = Math.Max(0, EditorGUILayout.IntField(listInfo.newPageIndex, GUILayout.Width(30)));

            EditorGUILayout.LabelField(" Each page shows ", GUILayout.Width(50));

            listInfo.onePageCnt = Math.Max(1, EditorGUILayout.IntField(listInfo.onePageCnt, GUILayout.Width(30)));

            if (GUILayout.Button(" Jump ", GUILayout.Width(40)))
            {
                listInfo.pageIndex = listInfo.newPageIndex;
                if (vertical)
                {
                    listInfo.pos.y = 0;
                }
                else
                {
                    listInfo.pos.x = 0;
                }
            }

            GUILayout.EndHorizontal();

            // list 
            listInfo.pos = GUILayout.BeginScrollView(listInfo.pos, svLp);

            var endIndex = Math.Min(startIndex + listInfo.onePageCnt, dataList.Count);

            if (vertical)
            {
                GUILayout.BeginVertical(containerLp);
            }
            else
            {
                GUILayout.BeginHorizontal(containerLp);
            }

            for (int i = startIndex; i < endIndex; i++)
            {
                renderFunc(i, dataList[i]);
            }

            if (vertical)
            {
                GUILayout.EndVertical();
            }
            else
            {
                GUILayout.EndHorizontal();
            }

            GUILayout.EndScrollView();

            return listInfo;
        }
    }
}