module-navigation-tool/Editor/Favorites/Utilities/FavoritesGUIUtility.cs

using UnityEditor;
using UnityEditorInternal;
using UnityEngine;

namespace Game.NavigationTool.Editor
{
    internal static class FavoritesGUIUtility
    {
        private static readonly int ENTRY_HASH = "DrawEntry".GetHashCode();
        
        public static Favorites.Entry manipulatingEntry;
        public static EManipulatingState manipulatingState;
        public static Favorites.Entry hoverEntry;
        
        public static void DrawEntry(Rect rect, Favorites.Entry entry, Styles styles, bool ignoreIndentLevel = false)
        {
            int id = GUIUtility.GetControlID(ENTRY_HASH, FocusType.Passive, rect);
            bool on = manipulatingEntry == entry;
            bool intersects = rect.Contains(Event.current.mousePosition);

            if (intersects)
                hoverEntry = entry;
            else if (hoverEntry == entry)
                hoverEntry = null;

            switch (Event.current.type)
            {
                case EventType.MouseDown:
                    if (intersects)
                    {
                        SetManipulating(entry, Event.current.button == 0 ? EManipulatingState.BeginClick : EManipulatingState.BeginContextClick);
                        Event.current.Use();
                    }
                    break;
                case EventType.MouseUp:
                    if (manipulatingEntry == entry)
                    {
                        if (manipulatingState == EManipulatingState.BeginClick)
                        {
                            if (intersects && Event.current.button == 0)
                                SetManipulating(entry, EManipulatingState.PerformedClick);
                            else
                                SetManipulating(entry, EManipulatingState.EndClick);
                        }
                        else if (manipulatingState == EManipulatingState.BeginContextClick)
                        {
                            if (intersects && Event.current.button == 1)
                                SetManipulating(entry, EManipulatingState.PerformedContextClick);
                            else
                                SetManipulating(entry, EManipulatingState.EndContextClick);
                        }
                        
                        Event.current.Use();
                    }
                    break;
                case EventType.MouseDrag:
                    if (manipulatingEntry == entry)
                        Event.current.Use();
                    break;
                case EventType.KeyDown:
                    break;
                case EventType.KeyUp:
                    break;
                case EventType.Repaint:
                    if (!ignoreIndentLevel)
                    {
                        rect.x += entry.indentLevel * 15.0f;
                        rect.width -= entry.indentLevel * 15.0f;
                    }

                    if (!entry.isAsset)
                        entry.content.image = entry.expanded ? styles.foldoutOut : styles.foldoutIn;
                    
                    styles.entry.Draw(rect, entry.content, id, on, intersects);
                    break;
                case EventType.DragUpdated:
                    break;
                case EventType.DragPerform:
                    break;
                case EventType.DragExited:
                    break;
            }
        }

        public static Texture2D GetIcon(string path)
        {
            var texture = AssetDatabase.GetCachedIcon(path) as Texture2D;
            
            if (texture == null)
                texture = InternalEditorUtility.GetIconForFile(path);

            return texture;
        }

        public static Texture2D GetFolderIcon()
        {
            return AssetDatabase.GetCachedIcon("Assets") as Texture2D;
        }

        private static void SetManipulating(Favorites.Entry entry, EManipulatingState state)
        {
            manipulatingEntry = entry;
            manipulatingState = state;
        }
        
        public static void ClearManipulating()
        {
            SetManipulating(null, EManipulatingState.None);
            hoverEntry = null;
        }
    }
}