Question

I want to activate a search textbox when the user starts to type something (even if the textbox isnt focused right then). I have come as far as setting KeyPreview on the form to true. Then in the KeyDown event handler, I have this:

if(!searchTextBox.Focused) {     searchTextBox.Focus(); } 

This almost works. The textbox is focused, but the first typed letter is lost. I guess this is because the textbox never really gets the event, since it wasn’t focused when it happend. So, do anyone have a clever solution to how I could make this work like it should?

I would also like some tips to how make this only happen when regular keys are pressed. So not like, arrow keys, modifier keys, function keys, etc. But this I will probably figure out a way to do. The previous issue on the other hand, I am not so sure how I should tackle…

Answer 1

As an addition to the answer from SDX2000, have a look at the MSDN article for the KeyDown event. It also refers to the KeyPressed event, which is fired after the KeyDown event, I think it is better suited for what you want to do.

Quoting MSDN:

A KeyPressEventArgs specifies the character that is composed when the user presses a key. For example, when the user presses SHIFT + K, the KeyChar property returns an uppercase K.

private void YourEventHandler(object Sender, KeyPressEventArgs Args) {     if(!searchTextBox.Focused)     {         searchTextBox.Focus();         searchTextBox.Text += Args.KeyChar;         // move caret to end of text because Focus() selects all the text         searchTextBox.SelectionStart = searchTextBox.Text.Length     } } 

I’m actually not certain that you can use += to append a char to a string, so you need to check on that. And I don’t know what happens when the user hits return, better follow up an that issue as well.