AutoCAD .NET Graphics Manager Events – View Related

AutoCAD .NET has wrapped almost all ObjectARX events through one way or another using still the event concept or something slightly different. As a whole, the AutoCAD .NET event or notification system is powerful and useful and a professional and relatively big addin cannot totally ignore the important force.

In this article, we will be talking about the AutoCAD .NET Graphics Manager Events. It is always good to start with some cool, concise and still full sample code. Here it is:

using System;
using System.Text;
using System.Linq;
using System.Xml;
using System.Reflection;
using System.ComponentModel;
using System.Collections;
using System.Collections.Generic;
using System.Windows;
using System.Windows.Media.Imaging;
using System.Windows.Forms;

using System.IO;
using Autodesk.AutoCAD.ApplicationServices;
using Autodesk.AutoCAD.DatabaseServices;
using Autodesk.AutoCAD.Runtime;
using Autodesk.AutoCAD.EditorInput;

using Autodesk.AutoCAD.Geometry;
using Autodesk.AutoCAD.Windows;

using AcadApplication = Autodesk.AutoCAD.ApplicationServices.Application;
using AcadDocument = Autodesk.AutoCAD.ApplicationServices.Document;
using AcadWindows = Autodesk.AutoCAD.Windows;

namespace AcadNetAddinWizard_Namespace
{
    public class GraphicsManagerEvents
    {
        [CommandMethod("TestGraphicsManagerEvents")]
        public void TestGraphicsManagerEvents_Method()
        {
            GraphicsManagerEvents eventManager = new GraphicsManagerEvents();
            eventManager.Register();
        }

        public void Register()
        {
            AcadApplication.DocumentManager.MdiActiveDocument.GraphicsManager.ConfigWasModified += new Autodesk.AutoCAD.GraphicsSystem.ConfigWasModifiedEventHandler(GraphicsManager_ConfigWasModified);
            AcadApplication.DocumentManager.MdiActiveDocument.GraphicsManager.ViewWasCreated += new Autodesk.AutoCAD.GraphicsSystem.ViewWasCreatedEventHandler(GraphicsManager_ViewWasCreated);
            AcadApplication.DocumentManager.MdiActiveDocument.GraphicsManager.ViewToBeDestroyed += new Autodesk.AutoCAD.GraphicsSystem.ViewToBeDestroyedEventHandler(GraphicsManager_ViewToBeDestroyed);
            AcadApplication.DocumentManager.MdiActiveDocument.GraphicsManager.GsToBeUnloaded += new Autodesk.AutoCAD.GraphicsSystem.GsToBeUnloadedEventHandler(GraphicsManager_GsToBeUnloaded);
        }

        void GraphicsManager_GsToBeUnloaded(object sender, EventArgs e)
        {
            //MessageBox.Show("GsToBeUnloaded");
            AcadApplication.DocumentManager.MdiActiveDocument.Editor.WriteMessage("GsToBeUnloaded\n");
        }

        void GraphicsManager_ViewToBeDestroyed(object sender, Autodesk.AutoCAD.GraphicsSystem.ViewEventArgs e)
        {
            //MessageBox.Show("ViewToBeDestroyed");
            AcadApplication.DocumentManager.MdiActiveDocument.Editor.WriteMessage("ViewToBeDestroyed\n");
        }

        void GraphicsManager_ConfigWasModified(object sender, EventArgs e)
        {
            //MessageBox.Show("ConfigWasModified");
            AcadApplication.DocumentManager.MdiActiveDocument.Editor.WriteMessage("ConfigWasModified\n");
        }

        void GraphicsManager_ViewWasCreated(object sender, Autodesk.AutoCAD.GraphicsSystem.ViewEventArgs e)
        {
            //MessageBox.Show("ViewWasCreated");
            AcadApplication.DocumentManager.MdiActiveDocument.Editor.WriteMessage("ViewWasCreated\n");
        }
}

After the command TestGraphicsManagerEvents runs, some view related Graphics Manager Events will be monitored such as GsToBeUnloaded, ViewToBeDestroyed, ConfigWasModified, and ViewWasCreated.

The code is short and self-explanatory so we will not waste our words here. Let us play around the command and look at some command outputs:

Command: TestGraphicsManagerEvents
Command: hide

Command: ViewWasCreated
ViewWasCreated
ViewToBeDestroyed
ViewToBeDestroyed
Command: SHADE
ViewWasCreated

Command: SHADEMODE
VSCURRENT
Enter an option
[2dwireframe/Wireframe/Hidden/Realistic/Conceptual/Shaded/shaded with
Edges/shades of Gray/SKetchy/X-ray/Other/cUrrent] <Current>: 2d
ViewToBeDestroyed
Regenerating model.