確定winform上的哪個文本框中有光標

Question

我正在通過VB.net在Windows窗體上工作。該表格包含兩個文本框和一個我自己編寫的屏幕鍵盤。

如何確定光標當前處於哪個文本框中，以便屏幕鍵盤將輸入正確的文本框？

該應用程序旨在完全基於觸摸。

Answer 1

我想猜你的屏幕鍵盤是一系列代表鍵盤的按鈕。

由於您有兩個文本框，您必須爲這兩個文本框都指定一個標誌，以表明它們具有焦點，而當其中一個具有焦點時，另一個不具有焦點。

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 

爲了您的鍵盤事件

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