Determine which textbox on winform has cursor in it - vb.net

Question

I am working on a Windows Form via VB.net. The form contains two textboxes and an onscreen keyboard that I have programmed myself.
How can I determine which textbox the cursor is currently in, so that the onscreen keyboard will type in the correct textbox?
The application is meant to be entirely touch based.

Answer 1

I'm going to guess that your onscreen keyboard is a series a buttons representing a keyboard.
Since you have two text boxes, you have to have a flag for both text boxes to indicate that they have focus, and when one has it the other doesn't.
Private Sub TextBox1_GotFocus(sender as Object, e as EventArgs) _
Handles TextBox1.GotFocus
// These flags are class level variables
textbox1HasFocus = true;
textbox2HasFocus = false;
End Sub
Private Sub TextBox2_GotFocus(sender as Object, e as EventArgs) _
Handles TextBox2.GotFocus
// These flags are class level variables
textbox2HasFocus = true;
textbox1HasFocus = false;
End Sub
For your keyboard events
Private Sub KeyBoard_Click(sender As Object, e As EventArgs) Handles ButtonA.Click, ButtonB.Click, ButtonC.Click, etc...
' I don't know how your using your keyboard, but buttonClickLetter could be determined in multiple ways. I would use either the Name of the control or even the Tag property for retrieving which letter to use
String buttonClickLetter = DirectCast(sender, Button).Tag.ToString()
If textbox1HasFocus Then
TextBox1.Text += buttonClickLetter
ElseIf textbox2HadFocus
TextBox2.Text += buttonClickLetter
End If
End Sub