RevitSdkSamples/SDK/Samples/ViewPrinter/CS/Command.cs

//
// (C) Copyright 2003-2019 by Autodesk, Inc.
//
// Permission to use, copy, modify, and distribute this software in
// object code form for any purpose and without fee is hereby granted,
// provided that the above copyright notice appears in all copies and
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using System;
using System.Collections.Generic;
using System.Text;
using System.Windows.Forms;

using Autodesk.Revit;
using Autodesk.Revit.UI;

namespace Revit.SDK.Samples.ViewPrinter.CS
{
    /// <summary>
    /// To add an external command to Autodesk Revit 
    /// the developer should implement an object that 
    /// supports the IExternalCommand interface.
    /// </summary>
    [Autodesk.Revit.Attributes.Transaction(Autodesk.Revit.Attributes.TransactionMode.Manual)]
    [Autodesk.Revit.Attributes.Regeneration(Autodesk.Revit.Attributes.RegenerationOption.Manual)]
    [Autodesk.Revit.Attributes.Journaling(Autodesk.Revit.Attributes.JournalingMode.NoCommandData)]
    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 Autodesk.Revit.UI.Result Execute(ExternalCommandData commandData,
        ref string message, Autodesk.Revit.DB.ElementSet elements)
        {
            Autodesk.Revit.DB.Transaction newTran = null;
            try
            {
                newTran = new Autodesk.Revit.DB.Transaction(commandData.Application.ActiveUIDocument.Document, "ViewPrinter");
                newTran.Start();

                PrintMgr pMgr = new PrintMgr(commandData);

                if (null == pMgr.InstalledPrinterNames)
                {
                    PrintMgr.MyMessageBox("No installed printer, the external command can't work.");
                    return Autodesk.Revit.UI.Result.Cancelled;
                }

                using (PrintMgrForm pmDlg = new PrintMgrForm(pMgr))
                {
                    if (pmDlg.ShowDialog() != DialogResult.Cancel)
                    {
                        newTran.Commit();
                        return Autodesk.Revit.UI.Result.Succeeded;
                    }
                    newTran.RollBack();
                }

            }
            catch (Exception ex)
            {
                if (null != newTran)
                    newTran.RollBack();
                message = ex.ToString();
                return Autodesk.Revit.UI.Result.Failed;
            }

            return Autodesk.Revit.UI.Result.Cancelled;
        }

    }
}