Form Recognition Remove Undo Button

Hello,​

Welcome to our Microsoft Q&A platform!

Are you referring to shape recognition in InkAnalyzer? Currently, InkAnalyzer does not provide operations such as undo, because it does not need to keep history. If you need to do it yourself.

This is a simple idea for a step back operation (based on windows-universal-samples InkAnalysis)

//create history record  
private List RemovedStorkes = new List();  
private Shape LastShape = null;  
  
//Add Stroke to history list before removing Stroke  
private void ConvertShapes()  
{  
    ....  
  
    RemovedStorkes.Clear();  
    // Select the strokes that were recognized, so we can delete them.  
    // The effect is that the shape added to the canvas replaces the strokes.  
    foreach (var strokeId in shape.GetStrokeIds())  
    {  
        InkStroke stroke = inkPresenter.StrokeContainer.GetStrokeById(strokeId);  
        stroke.Selected = true;  
        RemovedStorkes.Add(stroke);  
    }  
  
    ....  
}  
  
// Add history while doing shape conversion  
private void AddPolygonToCanvas(InkAnalysisInkDrawing shape)  
{  
    ...  
    LastShape = polygon;  
}  
  
//Undo  
private void UndoButton_Click(object sender, RoutedEventArgs e)  
{  
    inkPresenter.StrokeContainer.AddStrokes(RemovedStorkes.Select(p=>p.Clone()));  
    RemovedStorkes.Clear();  
    canvas.Children.Remove(LastShape);  
    LastShape = null;  
}  

This is a history implementation, if you need more effects, please implement it yourself.

Thanks