Keypress event back to caller from control

[Tom]

I have a VB.NET user control that I wrote - this control has three or four
other controls on it (textbox, combobox, datetime picker, etc). Now,
whenever the control is on a form and the user enters anything into the
textbox (for instance) I trap the keypress event to handle some stuff (i.e.
if it is an enter key, etc). Now, once I am done with handling the keypress
event for the textbox, I then need to pass that keypress event BACK to the
main form that is hosting the control. I can't just define another KeyPress
event and try a RaiseEvent because the control already has a keypress event.

I must be brain dead or something today, because normally I should be able
to figure this out but it just isn't coming to me. Once I am done with the
KeyPress event in my control, how can I pass that event (and it's data -
i.e. what key was pressed) back to the host form?

Tom

 

[Eric Dreksler]

Can you override the controls KeyPress event in the parent form, and then
just call the KeyPress event for the parent form when your done?

Or else raise a public event in the control and catch it in the parent form
(passing along
(ByVal sender As Object, ByVal e As System.EventArgs)) info and then call
the KeyPress event in the parent?

public class MyControl()

Public Event OnTextBox1KeyPress (ByVal sender as Object, ByVal e As
System.EventArgs)

Private Sub TextBox1_KeyPress (ByVal sender as Object, ByVal e As
System.EventArgs)

'Do something

RaiseEvent OnTextBox1KeyPress (sender,e)

End Sub

End Class



Public Class MyForm

Dim testcontrol as New MyControl

Private Sub testcontrol_KeyPressHandler (ByVal sender as Object, ByVal
e As System.EventArgs) _ Handles testcontrol_OnTextBox1KeyPress

MyForm_KeyPress (sender,e)

End Sub



Private Sub MyForm_KeyPress (ByVal sender as Object, ByVal e As
System.EventArgs) Handles MyForm.KeyPress

'Do Something

End Sub

End Class

I'm sure there is a better way, but this should work fairly easy as well.

Eric Dreksler

 

[schneider]

Is this for validation?

If so you could use the CausesValidation approach.

Schneider

 

[John Fiala]

I must be brain dead or something today, because normally I should be able
to figure this out but it just isn't coming to me. Once I am done with the
KeyPress event in my control, how can I pass that event (and it's data -
i.e. what key was pressed) back to the host form?

Tom

Do you need to return the sender as well? Otherwise, calling
<control>.OnKeyPress(e), where e is the event data object you
intercepted, should do it, right?

John Fiala
jcfiala523-at-hotmail.com
http://www.livejournal.com/users/fiala_tech/

 

[schneider]

Actually the form will get the event first if the Form.KeyPreview is set.

if you set the "e.handled=True" in the form, i think the control never gets
it.

Schneider