Please enable JavaScript to view this site.

Altova UModel 2020 Professional Edition

The "Statistics" sample listens for data modifications and counts elements of different element kinds. The sample uses both the UModel API and the UModel IDE Plug-In library. Since the plug-in derives from System.Windows.Forms.UserControl, it also acts as an ActiveX control and the results can be shown in a custom window inside UModel:

um_plugin_activex

This code is available in the following file: ..\UModelExamples\IDEPlugIn\StatisticsActiveX\StatisticsActiveX.cs.

 

To build and run the sample, the same requirements as for other UModel IDE Plug-ins apply, see Build and Run the Plug-In.

 

using System;
using System.Collections;
using System.Collections.Generic;
using System.Text;
using System.Drawing;
using System.Runtime.InteropServices.ComTypes;
using System.Windows.Forms;
using UModelLib;
using UModelPlugInLib;
 
/*
* StatisticsActiveX sample
* listen for data modifications and count the elements of the different element kinds
* show the result in a listview of an ActiveX control
*/
namespace StatisticsActiveX
{
  /* StatisticsActiveX is the main class of this plugin and implements UModelPlugInLib.IUModelPlugIn
    * it is also responsible for attaching/detaching _IApplicationEvents and _ITransactionEvents
    */
  public partial class StatisticsActiveX : UserControl,
                                            IUModelPlugIn,
                                          _IApplicationEvents,
                                          _ITransactionEvents
  {
      // a sorted dictionary to count the different element kinds
      private Statistics m_Statistics;
      // reference to the transaction notifier of a UModel document
      private TransactionNotifier m_TransactionNotifier;
      // connection point to _IApplicationEvents
      private IConnectionPoint m_cpApplicationEvents = null;
      // connection cookie
      int m_nApplicationtEventsCookie = 0;
 
      public StatisticsActiveX()
      {
          InitializeComponent();
      }
 
      #region IUModelPlugIn Members
 
      public string GetDescription()
      {
          return "PlugIn with ActiveX;This Plug-in demonstrates how to show an ActiveX control inside UModel.";
      }
 
      public string GetUIModifications()
      {
          // We don't add any menu or toolbar modifications.
          return "<ConfigurationData><Modifications/></ConfigurationData>";
      }
 
      public void OnInitialize(object pUModel)
      {
          // before processing DDE or batch commands
      }
 
      public void OnRunning(object pUModel)
      {
          // DDE or batch commands are processed; application is fully initialized
          // and we can attach to get _IApplicationEvents
 
          IApplication iApp = (IApplication)pUModel;
 
          if (m_cpApplicationEvents == null && iApp != null)
          {
              // find connection point of _IApplicationEvents
              IConnectionPointContainer icpc = (IConnectionPointContainer)iApp;
              Guid IID = typeof(UModelLib._IApplicationEvents).GUID;
              icpc.FindConnectionPoint(ref IID, out m_cpApplicationEvents);
 
              // advise UModelApplicationEvents as sink for _IApplicationEvents
              m_cpApplicationEvents.Advise(this, out m_nApplicationtEventsCookie);
          }
 
          AttachTransactionEvents(iApp.ActiveDocument);
      }
 
      public void OnShutdown(object pUModel)
      {
          // detach application events; stop receiving events
          DetachTransactionEvents();
 
          if (m_cpApplicationEvents != null)
          {
              // terminate established connection to _IApplicationEvents
              m_cpApplicationEvents.Unadvise(m_nApplicationtEventsCookie);
              m_cpApplicationEvents = null;
          }
 
          // application will shutdown; release all unused objects
          GC.Collect();
      }
 
      public void OnCommand(int nID, object pUModel)
      {
          // unused; we did not add any menu- or toolbar-commands
      }
 
      public UModelUpdateAction OnUpdateCommand(int nID, object pUModel)
      {
          // unused; we did not add any menu- or toolbar-commands
          return UModelUpdateAction.UModelUpdateAction_Disable;
      }
 
      #endregion
 
      private void AttachTransactionEvents(IDocument iDoc)
      {
          if (iDoc != null)
          {
              m_TransactionNotifier = iDoc.TransactionNotifier;
              if (m_TransactionNotifier != null)
              {
                  // we are only interested in 'OnEndDataModification' events so use and connect the delegate
                  m_TransactionNotifier.OnEndDataModification += new _ITransactionEvents_OnEndDataModificationEventHandler(OnEndDataModification);
              }
          }
 
          UpdateStatistics(iDoc);
      }
 
      // detach eventhandler from the transaction notifier
      private void DetachTransactionEvents()
      {
          if (m_TransactionNotifier != null)
          {
              m_TransactionNotifier.OnEndDataModification -= OnEndDataModification;
              m_TransactionNotifier = null;
          }
          UpdateStatistics(null);
      }
 
      void UpdateStatistics(IDocument iDoc)
      {
          // count current elements
          Statistics statistics = new Statistics();
 
          if (iDoc != null && iDoc.RootPackage != null)
              CountElements(iDoc.RootPackage, ref statistics);
 
          // anything changed to last update ?
          if (!statistics.IsEqual(m_Statistics))
          {
              m_Statistics = statistics;
              PopulateListView(m_Statistics);
          }
 
          // release unused objects
          GC.Collect();
      }
 
      private void CountElements(IUMLElement iElem, ref Statistics statistics)
      {
          // we only count editable elements
          if (iElem == null || iElem.IsEditable == false)
              return;
 
          string sKindName = iElem.KindName;
 
          if (!statistics.ContainsKey(sKindName))
              statistics[sKindName] = 1;
          else
              statistics[sKindName]++;
 
          foreach (IUMLElement iChild in iElem.OwnedElements)
              CountElements(iChild, ref statistics);
      }
 
      private void PopulateListView(Statistics statistics)
      {
          listView1.BeginUpdate();
 
          listView1.Items.Clear();
          foreach (KeyValuePair<string, int> kvp in statistics)
          {
              ListViewItem item = new ListViewItem(kvp.Key);
              item.SubItems.Add(Convert.ToString(kvp.Value));
 
              listView1.Items.Add(item);
          }
 
          listView1.EndUpdate();
      }
 
      #region _ITransactionEvents Members
 
      public void OnBeginDataModification(Document ipDocument)
      {
          // begin of transaction
      }
 
      public void OnEndDataModification(Document ipDocument)
      {
          // end of transaction - update statistics
          if (ipDocument != null && ipDocument.TransactionNotifier == m_TransactionNotifier)
              UpdateStatistics(ipDocument);
      }
 
      #endregion
 
      #region _IApplicationEvents Members
 
      public void OnNewDocument(Document ipDocument)
      {
          // a new document has been created in UModel => (re-)connect transaction events
          AttachTransactionEvents(ipDocument);
      }
 
      public void OnDocumentOpened(Document ipDocument)
      {
          // a document has been opened in UModel => (re-)connect transaction events
          AttachTransactionEvents(ipDocument);
      }
 
      public void OnDocumentClosed(Document ipDocument)
      {
          // document has been closed in UModel => disconnect transaction events
          if (ipDocument != null && ipDocument.TransactionNotifier == m_TransactionNotifier)
              DetachTransactionEvents();
      }
 
      public void OnShutdown()
      {
      }
 
      #endregion
 
 
      #region Statistics dictionary
 
      private class Statistics : SortedDictionary<string, int>
      {
          public bool IsEqual(Statistics other)
          {
              if (other == null)
                  return false;
 
              if (Count != other.Count)
                  return false;
 
              Enumerator e1 = GetEnumerator();
              Enumerator e2 = other.GetEnumerator();
              while (e1.MoveNext() && e2.MoveNext())
              {
                  if ((e1.Current.Key != e2.Current.Key) ||
                      (e1.Current.Value != e2.Current.Value))
                      return false;
              }
 
              return true;
          }
      }
 
      #endregion
  }
}

© 2019 Altova GmbH