RevitSdkSamples/snapshot/2022.1/Samples/RebarFreeForm/CS/CurveElementRegenUpdater.cs

using System;
using Autodesk.Revit.DB;
using RvtUpdaterId = Autodesk.Revit.DB.UpdaterId;
using RvtAddinId = Autodesk.Revit.DB.AddInId;
using System.Collections.Generic;
using System.IO;
using System.Windows.Forms;
using Autodesk.Revit.DB.Structure;
using System.Collections.ObjectModel;

namespace Revit.SDK.Samples.RebarFreeForm.CS
{
   /// <summary>
   /// This updater is used to regen rebar elements whenever a curveElement that was "Selected" is changed
   /// </summary>
   class CurveElementRegenUpdater : IUpdater
   {
      static AddInId m_appId;
      static UpdaterId m_updaterId;

      public CurveElementRegenUpdater(AddInId id)
      {
         m_appId = id;
         m_updaterId = new UpdaterId(m_appId, new Guid("0935FACA-29B6-468A-95E1-D121BEE58B62"));
      }
      public void Execute(UpdaterData data)
      {
         try
         {
            ICollection<ElementId> modifiedIds = data.GetModifiedElementIds();
            if (modifiedIds.Count > 0)// if any curveElement was modified
            {
               //get all rebar elements anf filter them, to see which need to be notified of the change
               FilteredElementCollector collector = new FilteredElementCollector(data.GetDocument());
               IList<Element> elemBars = collector.OfClass(typeof(Rebar)).ToElements();
               foreach (Element elem in elemBars)
               {
                  Rebar bar = elem as Rebar;
                  if (bar == null)
                     continue;
                  if (!bar.IsRebarFreeForm())// only need free form bars
                     continue;
                  RebarFreeFormAccessor barAccess = bar.GetFreeFormAccessor();
                  if (!barAccess.GetServerGUID().Equals(RebarUpdateServer.SampleGuid))// only use our custom FreeForm
                     continue;
                  Parameter paramCurveId = bar.LookupParameter(AddSharedParams.m_CurveIdName);
                  if (paramCurveId == null)
                     continue;
                  ElementId id = new ElementId(paramCurveId.AsInteger());
                  if (id == ElementId.InvalidElementId)
                     continue;
                  if (modifiedIds.Contains(id))// if id of line is in the rebar, then trigger regen
                  {
                     var param = bar.LookupParameter(AddSharedParams.m_paramName);
                     param.Set(param.AsInteger() == 0 ? 1 : 0);// just flip the value to register a change that will trigger the regeneration of that rebar on commit.
                  }
               }
               return;
            }
         }
         catch (Exception ex)
         {
            MessageBox.Show(ex.Message);
         }
      }

      public string GetAdditionalInformation()
      {
         return "this is a sample updater that reacts to changing model lines to change the rebar connected to it";
      }

      public ChangePriority GetChangePriority()
      {
         return ChangePriority.Structure;
      }

      public UpdaterId GetUpdaterId()
      {
         return m_updaterId;
      }

      public string GetUpdaterName()
      {
         return "Line change updater";
      }
   }
}