ManyItemsWindow.cs

ManyItemsWindow.cs

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

public class ManyItemsWindow : EditorWindow
{
    
    static ManyItemsWindow window;
    static readonly Vector2 windowMinSize = new Vector2 (700f, 300f);
    const float lineHeight = 16f;
    const string itemFormat = "item_{0:00000}";
    
    Dictionary<string, bool> items;
    List<string> keyList;
    bool initialized;
    Vector2 scrollPosition = Vector2.zero;
    float rootHeight = 0f;

    [MenuItem ("Tools/ManyItemsWindow")]
    static void Open ()
    {
        if (window == null) {
            window = CreateInstance<ManyItemsWindow> ();
        }
        
        window.minSize = windowMinSize;
        window.ShowUtility ();
    }

    void OnGUI ()
    {
        if (!initialized) {
            Initialize ();
        }
        
        GUILayout.BeginVertical ();
        
        var itemRoot = EditorGUILayout.BeginHorizontal ();
        scrollPosition = GUILayout.BeginScrollView (scrollPosition);
        
        // 上部の描画が不要なエリアをスペースで埋める
        var startIndex = (int)(scrollPosition.y / lineHeight);
        GUILayout.Space (startIndex * lineHeight);
        
        var listCount = keyList.Count;
        var endIndex = listCount;
        if (rootHeight > 0f) {
            endIndex = startIndex + (int)(rootHeight / lineHeight);
            if (endIndex > listCount) {
                endIndex = listCount;
            }
        }
        
        for (int i = startIndex; i < endIndex; i++) {
            var key = keyList [i];
            items [key] = GUILayout.Toggle (items [key], key, GUILayout.Height (lineHeight));
        }
        
        // 下部の描画が不要なエリアをスペースで埋める
        GUILayout.Space ((listCount - endIndex) * lineHeight);
        GUILayout.EndScrollView ();
        EditorGUILayout.EndHorizontal ();
        
        GUILayout.FlexibleSpace ();
        if (GUILayout.Button ("Close")) {
            window.Close ();
        }
        GUILayout.EndVertical ();
        
        // スクロールエリアの描画が完了したタイミングで更新
        if (itemRoot.height > 0f) {
            rootHeight = itemRoot.height;
        }
    }

    void Initialize ()
    {
        initialized = true;
        items = new Dictionary<string, bool> ();
        for (var i = 0; i < 10000; i++) {
            items.Add (i.ToString (itemFormat), false);
        }
        keyList = new List<string> (items.Keys);
    }

}