How to detect is opened preview document in type properties?

[ModPlus]

There is a "Preview" button in the type properties dialog. If you click it, then, as far as I know, a copy of the current document will be created with a new view (I could be wrong here):

The problem is that in this case IUpdater is triggered, which can lead to negative consequences.

Question - how can I detect that this Preview is open or how can I detect that the dialog for editing type properties is open?

[jeremy_tammik]

You use the native Windows API to detect that a specific Windows form is open. Presumably, this can also be done in .NET. You can search for something like ".net detect form open" to learn more:

• https://duckduckgo.com/?q=.net+detect+form+open

[nice3point]

You can try to track the DocumentChanged event, Revit creates elements and a view with a persistent name ‘Modify type attributes’. This name is probably language dependent, but Revit does not create any other events

[ModPlus]

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@nice3point wrote:

This name is probably language dependent

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Unfortunately, names are language-dependent

[ModPlus · Accepted solution]

@jeremy_tammik  did as you suggested. A small auxiliary class:

using System;
using System.Runtime.InteropServices;
using Autodesk.Revit.UI;

/// <summary>
/// Initializes a new instance of the <see cref="RevitWindowUtils"/> class.
/// </summary>
/// <param name="uiApplication"><see cref="UIApplication"/></param>
public class RevitWindowUtils(UIApplication uiApplication)
{
    private readonly IntPtr _mainWindowHandle = uiApplication.MainWindowHandle;

    [DllImport("user32.dll")]
    private static extern IntPtr GetActiveWindow();
    
    /// <summary>
    /// Is main Revit window active
    /// </summary>
    public bool IsMainWindowActive() => GetActiveWindow() == _mainWindowHandle;
}

I create and store its static instance in the application class, and check it in IUpdater as follows:

public void Execute(UpdaterData data)
{
    if (!App.RevitWindowUtils.IsMainWindowActive())
        return;

[jeremy_tammik]

Great! Glad to hear that it helped. Thank you for sharing your implementation. It looks nice and generic, and may be useful for other situations as well.

[jeremy_tammik]

... so, I shared it on the blog for future reference:

https://thebuildingcoder.typepad.com/blog/2024/05/lengthen-ducts-and-highlight-links.html#4

Thank you again for this.