Topic: Editing a selection set

[TheMaster]

Someone posted a question on Autodesk's discussion groups about how to edit a selection set.

I had this laying around, and added a few extension methods to make it simpler to use:

Code - C#: [Select]

1. /// ssedit.cs  (c) 2012 Tony Tanzillo
2. using System;
3. using System.Collections.Generic;
4. using System.Linq;
5. using System.Text;
6. using Autodesk.AutoCAD.Runtime;
7. using Autodesk.AutoCAD.DatabaseServices;
8. using Autodesk.AutoCAD.ApplicationServices;
9.  
10. namespace Autodesk.AutoCAD.EditorInput.MyExtensions
11. {
12.    public static class EditorExtensionMethods
13.    {
14.       /// Edit existing SelectionSet
15.       public static PromptSelectionResult EditSelection( this Editor ed,
16.           SelectionSet ss,
17.           PromptSelectionOptions options = null )
18.       {
19.          return new SelectionSetEditor( ed, ss, options ).EditSelection();
20.       }
21.  
22.       /// Edit a sequence or array of ObjectId[]
23.       public static PromptSelectionResult EditSelection( this Editor ed,
24.          IEnumerable<ObjectId> ids,
25.          PromptSelectionOptions options = null )
26.       {
27.          return new SelectionSetEditor( ed, ids, options ).EditSelection();
28.       }
29.  
30.    }
31.  
32.    public class SelectionSetEditor
33.    {
34.       Editor ed = null;
35.       PromptSelectionOptions options = null;
36.       IEnumerable<ObjectId> selection = null;
37.  
38.       public SelectionSetEditor( Editor editor, SelectionSet ss,
39.          PromptSelectionOptions options = null )
40.       {
41.          if( editor == null )
42.             throw new ArgumentNullException( "editor" );
43.          if( ss == null )
44.             throw new ArgumentNullException( "ss" );
45.          this.ed = editor;
46.          this.options = options ?? new PromptSelectionOptions();
47.          this.selection = ss.GetObjectIds();
48.       }
49.  
50.       public SelectionSetEditor( Editor editor, IEnumerable<ObjectId> ss,
51.           PromptSelectionOptions options = null )
52.       {
53.          if( editor == null )
54.             throw new ArgumentNullException( "editor" );
55.          if( ss == null )
56.             throw new ArgumentNullException( "ss" );
57.          this.ed = editor;
58.          this.options = options ?? new PromptSelectionOptions();
59.          this.selection = ss;
60.       }
61.  
62.       public PromptSelectionResult EditSelection()
63.       {
64.          if( this.selection.Any() )
65.          {
66.             ed.SelectionAdded += selectionAdded;
67.             /// A kludge that triggers the firing of the SelectionAdded event:
68.             ed.Document.SendStringToExecute( "_L\n", true, false, false );
69.          }
70.          return ed.GetSelection( options );
71.       }
72.  
73.       /// Removes the "Last" object added by the SendStringToExecute()
74.       /// kludge, and then adds the selection set to be edited:
75.       void selectionAdded( object sender, SelectionAddedEventArgs e )
76.       {
77.          ed.SelectionAdded -= selectionAdded;
78.          if( e.AddedObjects.Count > 0 )
79.             e.Remove( 0 );
80.          foreach( ObjectId id in this.selection )
81.             e.Add( new SelectedObject( id, SelectionMethod.NonGraphical, IntPtr.Zero ) );
82.       }
83.    }
84.  
85.    public static class SSEditExampleCommands
86.    {
87.       [CommandMethod( "SSEDIT" )]
88.       public static void SSEdit()
89.       {
90.          try
91.          {
92.             Document doc = Application.DocumentManager.MdiActiveDocument;
93.  
94.             /// Get an initial selection set that we
95.             /// will then allow the user to edit:
96.  
97.             Editor ed = doc.Editor;
98.             var psr = ed.GetSelection();
99.             if( psr.Status != PromptStatus.OK )
100.                return;
101.  
102.             /// Allow the user to edit the selection set
103.             /// acquired above:
104.            
105.             PromptSelectionResult result = ed.EditSelection( psr.Value );
106.  
107.             if( result != null && result.Value != null )
108.                doc.Editor.WriteMessage(
109.                   "\nEdited selection Count = {0}",
110.                   result.Value.Count );
111.          }
112.          catch( System.Exception ex )
113.          {
114.             throw ex;
115.          }
116.       }
117.    }
118. }
119.  
120.