RevitSdkSamples/snapshot/2008/SDK/Samples/VisibilityControl/Command.cs

//
// (C) Copyright 2003-2007 by Autodesk, Inc.
//
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using System;

using Autodesk.Revit;
using Autodesk.Revit.Elements;

namespace Revit.SDK.Samples.VisibilityController.CS
{
    /// <summary>
    /// Implements the Revit add-in interface IExternalCommand
    /// </summary>
    public class Command : IExternalCommand
    {
        /// <summary>
        /// Implement this method as an external command for Revit.
        /// </summary>
        /// <param name="commandData">An object that is passed to the external application 
        /// which contains data related to the command, 
        /// such as the application object and active view.</param>
        /// <param name="message">A message that can be set by the external application 
        /// which will be displayed if a failure or cancellation is returned by 
        /// the external command.</param>
        /// <param name="elements">A set of elements to which the external application 
        /// can add elements that are to be highlighted in case of failure or cancellation.</param>
        /// <returns>Return the status of the external command. 
        /// A result of Succeeded means that the API external method functioned as expected. 
        /// Cancelled can be used to signify that the user cancelled the external operation 
        /// at some point. Failure should be returned if the application is unable to proceed with 
        /// the operation.</returns>
        public virtual IExternalCommand.Result Execute(ExternalCommandData commandData
            , ref string message, ElementSet elements)
        {
            try
            {
                if (null == commandData)
                {
                    throw new ArgumentNullException("commandData");
                }

                // create an instance of VisibilityCtrl
                VisibilityCtrl visiController = new VisibilityCtrl(commandData.Application.ActiveDocument);
                commandData.Application.ActiveDocument.BeginTransaction();
                // create a user interface form
                using (VisibilityCtrlForm dlg = new VisibilityCtrlForm(visiController))
                {
                    // show dialog
                    System.Windows.Forms.DialogResult result = dlg.ShowDialog();

                    if (result == System.Windows.Forms.DialogResult.OK)
                    {
                        commandData.Application.ActiveDocument.EndTransaction();
                        return IExternalCommand.Result.Succeeded;
                    }
                    else if (result == System.Windows.Forms.DialogResult.Yes)
                    {
                        // isolate the selected element(s)
                        visiController.Isolate();
                        commandData.Application.ActiveDocument.EndTransaction();
                        return IExternalCommand.Result.Succeeded;
                    }
                }

                commandData.Application.ActiveDocument.AbortTransaction();
                return IExternalCommand.Result.Cancelled;
            }
            catch (Exception ex)
            {
                message = ex.Message;
                return IExternalCommand.Result.Failed;
            }
        }

    }

}