80 lines
2.3 KiB
C#
80 lines
2.3 KiB
C#
using System.Collections.Generic;
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using System.Linq;
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using UnityEditor;
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using UnityEngine;
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namespace DA_Assets.DAI
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{
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public delegate void DrawItem<T>(T item);
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public class InfinityScrollRectWindow<T, T4> where T4 : CustomInspector<T4>, ICustomInspector
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{
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public DAInspector gui => CustomInspector<T4>.Instance.Inspector;
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private T[] _items;
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private Vector2 _scrollPosition;
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protected int _visibleItemCount;
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protected float _itemHeight;
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private float _totalScrollHeight;
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private float _visibleAreaHeight;
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private DrawItem<T> _drawItem;
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public InfinityScrollRectWindow(int visibleItemCount, float itemHeight)
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{
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_visibleItemCount = visibleItemCount;
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_itemHeight = itemHeight;
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}
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public void SetData(IEnumerable<T> items, DrawItem<T> drawItem)
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{
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_drawItem = drawItem;
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_items = items.ToArray();
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if (_items.Length < _visibleItemCount)
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{
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_visibleItemCount = _items.Length;
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}
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_visibleAreaHeight = _visibleItemCount * _itemHeight;
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_totalScrollHeight = _items.Length * _itemHeight;
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}
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public void OnGUI()
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{
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if (_items == null || _items.Length < 1)
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{
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GUILayout.Label("No data.");
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return;
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}
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if (_drawItem == null)
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{
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GUILayout.Label("DrawItem is missing.");
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return;
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}
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gui.Colorize(() =>
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{
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_scrollPosition = EditorGUILayout.BeginScrollView(_scrollPosition, GUILayout.Height(_visibleAreaHeight));
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});
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float currentScrollPos = _scrollPosition.y;
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int startIndex = Mathf.Max(0, (int)(currentScrollPos / _itemHeight) - 1);
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int endIndex = Mathf.Min(_items.Length, startIndex + _visibleItemCount + 2);
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GUILayout.BeginVertical();
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GUILayout.Space(startIndex * _itemHeight);
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for (int i = startIndex; i < endIndex; i++)
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{
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_drawItem(_items[i]);
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}
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GUILayout.Space(_totalScrollHeight - endIndex * _itemHeight);
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GUILayout.EndVertical();
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EditorGUILayout.EndScrollView();
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}
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}
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}
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