RevitSdkSamples/snapshot/2014/bc/BuildingCoder/BuildingCoder/CmdNewWallLayer.cs

#region Header
//
// CmdNewWallLayer.cs - create a new compound wall layer.
//
// Copyright (C) 2009-2013 by Jeremy Tammik,
// Autodesk Inc. All rights reserved.
//
#endregion // Header

#region Namespaces
using System;
using System.Collections.Generic;
using System.Diagnostics;
using Autodesk.Revit.ApplicationServices;
using Autodesk.Revit.Attributes;
using Autodesk.Revit.DB;
using Autodesk.Revit.UI;
using Autodesk.Revit.UI.Selection;
#endregion // Namespaces

namespace BuildingCoder
{
  /// <summary>
  /// Demonstrate that the compound layer structure can be edited
  /// and added to prior from Revit 2012 onwards. This was previously
  /// impossible, and the whole compound structure was read-only.
  /// </summary>
  [Transaction( TransactionMode.Automatic )]
  class CmdNewWallLayer : IExternalCommand
  {
    public Result Execute(
      ExternalCommandData commandData,
      ref string message,
      ElementSet elements )
    {
      UIApplication app = commandData.Application;
      Document doc = app.ActiveUIDocument.Document;

#if _2011
      //
      // code for the Revit 2011 API:
      //
      Debug.Assert( false,
        "Currently, no new wall layer can be created, because"
        + "there is no creation method available for it." );

      foreach( WallType wallType in doc.WallTypes )
      {
        if( 0 < wallType.CompoundStructure.Layers.Size )
        {
          CompoundStructureLayer oldLayer
            = wallType.CompoundStructure.Layers.get_Item( 0 );

          WallType newWallType
            = wallType.Duplicate( "NewWallType" ) as WallType;

          CompoundStructure structure
            = newWallType.CompoundStructure;

          CompoundStructureLayerArray layers
            = structure.Layers;


          // from here on, nothing works, as expected:
          // in the Revir 2010 API, we could call the constructor
          // even though it is for internal use only.
          // in 2011, it is not possible to call it either.

          CompoundStructureLayer newLayer = null;
          //  = new CompoundStructureLayer(); // for internal use only

          newLayer.DeckProfile = oldLayer.DeckProfile;
          //newLayer.DeckUsage = oldLayer.DeckUsage; // read-only
          //newLayer.Function = oldLayer.Function; // read-only
          newLayer.Material = oldLayer.Material;
          newLayer.Thickness = oldLayer.Thickness;
          newLayer.Variable = oldLayer.Variable;
          layers.Append( newLayer );

        }
      }
#endif // _2011

      //WallTypeSet wallTypes = doc.WallTypes; // 2013 

      FilteredElementCollector wallTypes 
        = new FilteredElementCollector( doc )
          .OfClass( typeof( WallType ) ); // 2014

      foreach( WallType wallType in wallTypes )
      {
        if( 0 < wallType.GetCompoundStructure().GetLayers().Count )
        {
          CompoundStructureLayer oldLayer
            = wallType.GetCompoundStructure().GetLayers()[0];

          WallType newWallType
            = wallType.Duplicate( "NewWallType" ) as WallType;

          CompoundStructure structure
            = newWallType.GetCompoundStructure();

          IList<CompoundStructureLayer> layers
            = structure.GetLayers();

          // in Revit 2012, we can create a new layer:

          double width = 0.1;
          MaterialFunctionAssignment function = oldLayer.Function;
          ElementId materialId = oldLayer.MaterialId;

          CompoundStructureLayer newLayer
            = new CompoundStructureLayer( width, function, materialId );

          layers.Add( newLayer );
          structure.SetLayers( layers );
          newWallType.SetCompoundStructure( structure );
        }
      }
      return Result.Succeeded;
    }
  }
}