Diagrams User Guide
Diagrams : Appendices : Customisation : Using the Visio Drawing Control
Using the Visio Drawing Control
The Visio Drawing Control can be accessed in different ways. By using reflection, it is possible to invoke GetCurrentVisio method which will return an instance of Visio.Application associated with currently active drawing.
Example
using System;
using Visio=Microsoft.Office.Interop.Visio;
using Aveva.Diagrams;
 
namespace UserAddin
{
  /// <summary>
  /// Summary description for AccessVisio.
  /// </summary>
  internal class AccessVisio
  {
     internal AccessVisio()
      {
         //
         // TODO: Add constructor logic here
         //
      }
  internal static bool IsDrawingActive()
  {
     System.Reflection.Assembly _assembly =         System.Reflection.Assembly.Load( "diagrams" );
     System.Type _type = _assembly.GetType(        "Aveva.Diagrams.diagApp",
                    true,
                    false );
     System.Reflection.MethodInfo _info = _type.GetMethod(                                   "GetCurrentVisio",
                                  System.Reflection.BindingFlags.Static |
                                  System.Reflection.BindingFlags.Public );
     Visio.Application visApp = (Visio.Application)_info.Invoke
                                 ( null, null );
     if(visApp == null)
         return false;
 
    return true;
  }
  internal static void AddDescription(string ElemType, string Description)
  {
     System.Reflection.Assembly _assembly =      System.Reflection.Assembly.Load( "diagrams" );
     System.Type _type = _assembly.GetType(      
"AvevaDiagrams.diagApp",
                  true,
                  false );
 
     System.Reflection.MethodInfo _info = _type.GetMethod(                                   "GetCurrentVisio",
                                  System.Reflection.BindingFlags.Static |
                                  System.Reflection.BindingFlags.Public );
     Visio.Application visApp = (Visio.Application)_info.Invoke( null, null );
 
     if(visApp == null)
          return;
   //Find all shapes of type ElemType and add Description
   foreach(Visio.Shape shape in visApp.ActivePage.Shapes)
   {
      try
     {
                     if(shape.get_CellsU("User.ElementType").get_ResultStr
       (Visio.VisUnitCodes.visNoCast) == ElemType)
         {
            try
             {
                     shape.get_CellsU("Prop.VMD_SCEQUI_DESC").FormulaU =
               string.Format("\"{0}\"", Description);
             }
             catch(Exception){};
         }
       }
       catch(Exception){};
     }
    }
  }
}
Another approach is to use the AVEVA.ApplicationFramework.Presentation.WindowManager and iterate through the windows looking for an active Drawing Control.
Example
if( WindowManager.Instance.MainForm.ActiveMdiChild != null )
{
   _activeCtrl = WindowManager.Instance.MainForm.ActiveMdiChild.ActiveControl;
   if(_activeCtrl != null && !(_activeCtrl is AxDrawingControl))
   {
       foreach(System.Windows.Forms.Control ctrl in
       WindowManager.Instance.MainForm.ActiveMdiChild.ActiveControl.Controls)
      {
          if(ctrl is AxDrawingControl)
          {
              _activeCtrl = ctrl;
              break;
          }
      }
   }
}
When the Visio.Application instance is obtained from the Drawing Control it is possible to invoke any of the Visio API methods available to customize the drawing.
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