The text field does not lose focus

Question

I have a form that covers the entire screen. I have a textbox on it, which is usually hidden, but appears when the user clicks, drags, and then leaves. After that, the user can enter any value in the text box. After entering, ideally, the user should be able to click outside the text box, and then continue normal maintenance.

By means of a regular service, I mean that the form should begin to receive all events. What I have done so far is the TextBox KeyDown event; when the Escape key is pressed, I set the focus to the main form as follows:

 this.Focus(); //where this is mainform. 

But this does not seem to work, as the textbox still continues to receive all the keys. I have a KeyDown handler for both Form and textbox , and I have verified that all KeyDown events are passed to the TextBox. I have a textbox Leave event handler that never gets called.

This textbox is the only form control, and the main form is used to draw shapes (if that matters).

So, how can I make this textbox lose focus when the user clicks on it.

Answer 1

if it works like in VB, for what I remember, try setting the KeyPreview form KeyPreview to false so that all keys are transmitted only by the focused control on the form.

Answer 2

If you set your KeyPreview form to true, your form has the first chance to handle any keystrokes that you make. If this is what you want to process, that is, an escape, as in the above comment, process it in your KeyDownEvent form and mark it as processed so that your text box does not see it.

Top Msdn Page:

If this property is set to true, the form will receive all KeyPress, KeyDown, and KeyUp events. After the event handlers of the form have completed the keystroke processing, the keystroke is then assigned to the control with focus.

Answer 3

I think back in 11 this did not work, but now

 this.ActiveControl = null; 

works great. However, if you intend to use Tab to control the loop, focusing the label with a suitable TabIndex is the way to go.