Fire Events When Dragging Instant3D Manipulator in a Part Example (C#)

This example shows how to fire events when dragging an Instant3D manipulator in a part document.

//------------------------------------
// Preconditions:
// 1. Open a part document.
// 2. Open the Immediate window.
//
// NOTE: Instant3D is enabled by the macro.
//
// Postconditions:
// 1. Select an Instant3D manipulator in the
//    open part. For example,
//    double-click an extrude feature in a part,
//    then select one of the Instant3D manipulators
//    and drag it.
// 2. Writes a debug statement to the Immediate
//    window informing you that dragging of an
//    Instant3D manipulator has started.
// 3. Stop dragging the manipulator.
// 4. Writes a debug statement to the Immediate
//    window informing you that dragging of
//    an Instant3D manipulator has stopped.
// 5. Examine the Immediate window.
//----------------------------------------
using SolidWorks.Interop.sldworks;
using SolidWorks.Interop.swconst;
using System;
using System.Collections;
using System.Diagnostics;
namespace DragStateChangeNotifyPartCSharp.csproj
{
    partial class SolidWorksMacro    {
        public PartDoc pDoc;
        public FeatureManager swFeatMgr;
        public void Main()
        {
            ModelDoc2 swModel;
            Hashtable openPart;

            swModel = (ModelDoc2)swApp.ActiveDoc;

            //Enable Instant3D manipulators
            swFeatMgr = (FeatureManager)swModel.FeatureManager;
            swFeatMgr.MoveSizeFeatures = true;

            // Set up event handler
            pDoc = (PartDoc)swModel;
            openPart = new Hashtable();

            AttachEventHandlers();
        }

        public void AttachEventHandlers()
        {
            AttachSWEvents();
        }

        public void AttachSWEvents()
        {
            if ((pDoc != null))
            {
                pDoc.DragStateChangeNotify += this.pDoc_DragStateChangeNotify;
            }
        }

        private int pDoc_DragStateChangeNotify(bool State)
        {
            int functionReturnValue = 0;
            // Write debug statement when dragging of manipulator started and stopped            
            if (State == true)
            {
                Debug.Print("Dragging of manipulator started.");
                functionReturnValue = 1;
            }            else
            {
                Debug.Print("Dragging of manipulator stopped.");
                functionReturnValue = 0;
            }
            return functionReturnValue;
        }

        /// <summary>
        /// The SldWorks swApp variable is pre-assigned for you.
        /// </summary>
        public SldWorks swApp;

    }
}