Touch keyboard hides in Tablet mode when override AutomationPeer with FrameworkElementAutomationPeer in WPF

Question

Hi ,

When I create a new control which is inherited from WPF TextBox and override it's AutomationPeer with FrameworkElementAutomationPeer , the touch keyboard hides when focused or clicked inside the new control. I have attached the code below, it will be really helpful if anyone can provide a suitable solution for this issue.

 public class NewTextBox : TextBox, IDisposable
    {
        public void Dispose()
        {

        }

        protected override AutomationPeer OnCreateAutomationPeer()
        {
            return new NewAutomationPeer(this);
        }
    }

    public class NewAutomationPeer : FrameworkElementAutomationPeer
    {
        public NewAutomationPeer(NewTextBox owner) : base(owner)
        {

        }
    }

Note : Touch keyboard opens and works fine when I override the GetAutomationControlTypeCore method and return AutomationType.Edit. But I want to return the AutomationType.Custom (since my new control is custom control) and it does not work fine. Please consider this scenario while providing solution.

Answer 1

You could automatically open the Touch keyboard by starting taptix.exe. You can try to refer to the following code.
The code of MainWindow.xaml is as follows:

<local:NewTextBox Width="100" Height="30" Background="LightGreen" ></local:NewTextBox>  

The code of NewTextBox is as follows:

public class NewTextBox : TextBox  
  {  
    
    public NewTextBox()  
    {  
      this.GotFocus += TextBox_GotFocus;  
    }  
  
    private void TextBox_GotFocus(object sender, RoutedEventArgs e)  
    {  
      RegistryKey registryKey = Registry.CurrentUser.CreateSubKey("Software\\Microsoft\\TabletTip\\1.7");  
  
      registryKey?.SetValue("KeyboardLayoutPreference", 0, RegistryValueKind.DWord);  
      registryKey?.SetValue("LastUsedModalityWasHandwriting", 1, RegistryValueKind.DWord);  
  
      Process.Start(@"C:\Program Files\Common Files\Microsoft Shared\ink\TabTip.exe");  
    }  
  }  

The result is shown in the figure:

Answer 2

Hi @Niranjan Kumar Gopalan did you manage to show/hide the Touch Keyboard in your WPF application? I am developing similar application and looking for best solutions.