ShrlAlgoToolkit/ShrlAlgoToolkit.Revit/Assists/DwgBlockSelection.cs

using Autodesk.Revit.DB;
using Autodesk.Revit.UI.Selection;

namespace ShrlAlgoToolkit.Revit.Assists;

/// <summary>
/// dwg块选择过滤
/// </summary>
public class DwgBlockSelection : ISelectionFilter
{
    private Element e;

    public bool AllowElement(Element elem)
    {
        e = elem;
        return e.Document.GetElement(e.GetTypeId()) is CADLinkType;
    }

    public bool AllowReference(Reference reference, XYZ position)
    {
        //块
        var instance = e.GetGeometryObjectFromReference(reference) as GeometryInstance;
        if (instance == null)
        {
            return false;
        }
        ////dwg
        //foreach (var dwgIns in e.get_Geometry(new Options()))
        //{
        //    if (dwgIns is not GeometryInstance item) continue;
        //    //遍历dwg包含的所有内容
        //    foreach (var obj in item.SymbolGeometry)
        //    {
        //        return obj is GeometryInstance ins && !ins.SymbolGeometry.Any();
        //    }
        //}

        //if (selectBlock == null)
        //{
        //    return false;
        //}
        //块是否包含子块
        //foreach (var item in instance.SymbolGeometry)
        //{
        //    if (item is GeometryInstance)
        //    {
        //        return false;
        //    }
        //}
        //var isNest = selectBlock.SymbolGeometry.OfType<GeometryInstance>().Any();
        return /*!isNest &&*/ reference.ElementReferenceType == ElementReferenceType.REFERENCE_TYPE_INSTANCE
                              && instance.GraphicsStyleId != ElementId.InvalidElementId;
    }
}