Hello Valentin,

You are right, the described scenario might occur commonly, so I've logged an item to create an example at some point in time that shows a bit more refined approach, using RadRichTextBox and RadSpeechToTextButton. I also updated your Telerik points, as a small token of gratitude for bringing this to our attention.

As for the RadDocumentEditor, it doesn't replace the ActiveDocumentEditor. This is just a helper class that allows you to manipulate the document more easily.

Regards,
Martin Ivanov
Progress Telerik

Hello Valentin,

We don't have an example with RadRichTextBox, but here is what you can do. You can use the SpeechRecognized event of RadSpeechToTextButton to get the recognized text and then use the RadDocumentEditor to update the document. Based on the exact behavior you would expect the implementation may vary. Here is a basic approach that you can explore and modify if needed to match your requirement more closely.

private RadDocumentEditor documentEditor;
private PointF positionOrigin;        

public MainWindow()
{
    InitializeComponent();
    documentEditor = new RadDocumentEditor(this.rtb.Document);
}

private void RadSpeechToTextButton_SpeechRecognized(object sender, Telerik.SpeechRecognizer.SpeechRecognizerSpeechRecognizedEventArgs e)
{
    var start = new DocumentPosition(rtb.Document.CaretPosition);
    start.SetPosition(positionOrigin);
    var end = new DocumentPosition(rtb.Document.CaretPosition);
    rtb.Document.Selection.SetSelectionStart(start);
    rtb.Document.Selection.AddSelectionEnd(end);

    documentEditor.Delete(true);
    documentEditor.Insert(e.FullText);
}

private void sttb_StateChanged(object sender, EventArgs e)
{
    if (sttb.State == Telerik.SpeechRecognizer.SpeechRecognizerState.Listening)
    {
        positionOrigin = rtb.Document.CaretPosition.Location;
    }
}

Regards,
Martin Ivanov
Progress Telerik

Hello Valentin,

I have investigated this, and the issue is located in the .NET Framework. I have tested this with the latest Windows version (25H2), and there is no exception there. However, this is still not working there as expected. 

We have introduced a new SpeechToTextButton control that can be used for this. I would recommend using it instead since it works better than the default Windows recognition.

Please note that the workaround will break other functionalities, like Microsoft IME and inserting emoji icons. 

Thank you for your understanding.

Regards,
Dimitar
Progress Telerik

Hello Valentin,

This is not included in the current planning and I can't provide you with a specific timeframe for fixing this. You can follow the feedback item to get notified as its status changes. 

In the meantime, if you need to add speech input in the RadRichTextBox, you can use the new RadSpeechToTextButton which was just released.

You can disable the Win+H voice typing for the RadRichTextBox by setting the InputMethod.IsInputMethodEnabled attached property to False. You can set it on the Caret element via an implicit style.

<telerik:RadRichTextBox>
    <telerik:RadRichTextBox.Resources>
        <!-- remove the BasedOn setting if you use the Xaml version of the Telerik dlls -->
        <!-- https://www.telerik.com/products/wpf/documentation/styling-and-appearance/xaml-vs-noxaml -->
        <Style TargetType="telerik:Caret" BasedOn="{StaticResource CaretStyle}">
            <Setter Property="InputMethod.IsInputMethodEnabled" Value="False" />
        </Style>
    </telerik:RadRichTextBox.Resources>
</telerik:RadRichTextBox>

This way when you show the voice typing dialog while the RichTextBox is focused, a message similar to the following will be displayed:

Regards,
Martin Ivanov
Progress Telerik