siege-song/Data/Library/PackageCache/com.unity.probuilder@5.0.3/Editor/MenuActions/Selection/SelectHole.cs

using UnityEngine;
using UnityEditor;
using UnityEditor.ProBuilder.UI;
using System.Linq;
using System.Collections.Generic;
using UnityEngine.ProBuilder;
using UnityEditor.ProBuilder;
using UnityEngine.ProBuilder.MeshOperations;

namespace UnityEditor.ProBuilder.Actions
{
    sealed class SelectHole : MenuAction
    {
        public override ToolbarGroup group
        {
            get { return ToolbarGroup.Selection; }
        }

        public override Texture2D icon
        {
            get { return IconUtility.GetIcon("Toolbar/Selection_SelectHole", IconSkin.Pro); }
        }

        public override TooltipContent tooltip
        {
            get { return s_Tooltip; }
        }

        private static readonly TooltipContent s_Tooltip = new TooltipContent
            (
                "Select Holes",
                "Selects holes on the mesh.\n\nUses the current element selection, or tests the whole mesh if no edges or vertices are selected."
            );

        public override SelectMode validSelectModes
        {
            get { return SelectMode.Vertex | SelectMode.Edge; }
        }

        public override bool enabled
        {
            get { return base.enabled && MeshSelection.selectedObjectCount > 0; }
        }

        protected override ActionResult PerformActionImplementation()
        {
            UndoUtility.RecordSelection("Select Hole");

            ActionResult res = ActionResult.NoSelection;

            foreach (ProBuilderMesh pb in MeshSelection.topInternal)
            {
                bool selectAll = pb.selectedIndexesInternal == null || pb.selectedIndexesInternal.Length < 1;
                IEnumerable<int> indexes = selectAll ? pb.facesInternal.SelectMany(x => x.indexes) : pb.selectedIndexesInternal;

                List<List<Edge>> holes = ElementSelection.FindHoles(pb, indexes);

                res = new ActionResult(ActionResult.Status.Success, holes.Count > 0 ? string.Format("{0} holes found", holes.Count) : "No Holes in Selection");

                pb.SetSelectedEdges(holes.SelectMany(x => x));
            }

            ProBuilderEditor.Refresh();

            return res;
        }
    }
}