assets/samples/Samples/InCanvasControlAPI/CS/IssueMarkerUpdater.cs

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using Autodesk.Revit.DB;
using Autodesk.Revit.DB.Events;

namespace Revit.SDK.Samples.InCanvasControlAPI.CS
{
   /// <summary>
   /// This class demonstrates updating in-canvas controls in a DocumentUpdated event handler.
   /// </summary>
   public class IssueMarkerUpdater
   {
      #region Class implementation

      /// <summary>
      /// Perform updates on in-canvas controls.
      /// In this example, the In-Canvas controls will be deleted, or have their positions changed, depending on the changes to related elements.
      /// </summary>
      /// <param name="data">Data about changes in the document.</param>
      public static void Execute(DocumentChangedEventArgs data)
      {
         Document doc = data.GetDocument();
         TemporaryGraphicsManager temporaryGraphicsManager = TemporaryGraphicsManager.GetTemporaryGraphicsManager(doc);
         IssueMarkerTracking tracking = IssueMarkerTrackingManager.GetInstance().GetTracking(doc);
         
         foreach (ElementId deleted in data.GetDeletedElementIds())
         {
            if (tracking.GetMarkerByElementId(deleted) is IssueMarker marker)
            {
               // This is how to delete control
               temporaryGraphicsManager.RemoveControl(marker.ControlIndex);

               // Don't forget to clean up your own data
               tracking.RemoveMarkerByElement(deleted);
            }
         }

         foreach (ElementId updated in data.GetModifiedElementIds())
         {
            if (tracking.GetMarkerByElementId(updated) is IssueMarker marker)
            {
               Element element = doc.GetElement(updated);

               // Since we keep a copy of InCanvasControlData, we can avoid creating a new one. It already has image and position set - and we can just change the position
               InCanvasControlData controlData = marker.InCanvasControlData;
               if (element.Location is LocationPoint pointLoc)
               {
                  controlData.Position = pointLoc.Point;
               }
               else if (element.Location is LocationCurve curveLoc)
               {
                  controlData.Position = curveLoc.Curve.GetEndPoint(0);
               }

               marker.InCanvasControlData = controlData;

               // This is how to set updated data to a control
               temporaryGraphicsManager.UpdateControl(marker.ControlIndex, marker.InCanvasControlData);
            }
         }
      }

      #endregion

   }
}