module-navigation-tool/Editor/History/Utilities/HistoryGUIUtility.cs

using UnityEditor;
using UnityEditorInternal;
using UnityEngine;

namespace Module.NavigationTool.Editor.History
{
    internal static class HistoryGUIUtility
    {
        private static readonly int ENTRY_HASH = "DrawHistoryEntry".GetHashCode();

        public static bool isClicked;
        public static bool isDoubleClick;
        public static HistoryList.Entry currentEntry;
        
        private static HistoryList.Entry LAST_CLICK_ENTRY;
        private static double LAST_CLICK_TIME;
        private static int CLICK_COUNT;

        public static void DrawEntry(Rect rect, HistoryList.Entry entry, Styles styles, bool ignoreIndentLevel = false)
        {
            int id = GUIUtility.GetControlID(ENTRY_HASH, FocusType.Passive, rect);
            bool on = currentEntry == entry;
            bool intersects = rect.Contains(Event.current.mousePosition);
            
            switch (Event.current.type)
            {
                case EventType.MouseDown:
                    if (intersects)
                    {
                        currentEntry = entry;
                        Event.current.Use();
                    }
                    break;
                case EventType.MouseUp:
                    if (currentEntry == entry)
                    {
                        isClicked = intersects;

                        if (isClicked)
                        {
                            double dt = EditorApplication.timeSinceStartup - LAST_CLICK_TIME;

                            if (dt < 0.3 && CLICK_COUNT == 1 && LAST_CLICK_ENTRY == entry)
                                CLICK_COUNT++;
                            else
                                CLICK_COUNT = 1;

                            LAST_CLICK_ENTRY = entry;
                            LAST_CLICK_TIME = EditorApplication.timeSinceStartup;
                            isDoubleClick = CLICK_COUNT == 2;
                        }
                        else
                        {
                            currentEntry = null;
                        }

                        if (!isClicked)
                            currentEntry = null;
                        
                        Event.current.Use();
                    }
                    break;
                case EventType.Repaint:
                    Vector2 oldSize = EditorGUIUtility.GetIconSize();
                    EditorGUIUtility.SetIconSize(new Vector2(rect.height, rect.height));
                    GUIStyle style = entry.valid ? styles.entry : styles.invalidEntry;
                    style.Draw(rect, entry.content, id, on, intersects);
                    EditorGUIUtility.SetIconSize(oldSize);
                    break;
            }
        }

        public static void Used()
        {
            isClicked = false;
            currentEntry = null;
        }
        
        public static Texture2D GetIcon(string path)
        {
            var texture = AssetDatabase.GetCachedIcon(path) as Texture2D;
            
            if (texture == null)
                texture = InternalEditorUtility.GetIconForFile(path);

            return texture;
        }

        public static void Repaint()
        {
            if (!EditorWindow.HasOpenInstances<EditorHistoryWindow>())
                return;
            
            var window = EditorWindow.GetWindow<EditorHistoryWindow>("History", false);
            window.Repaint();
        }
    }
}