Problem in assigning keyboard shourtcuts to button

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Hi all

I used the below code to assign the shortcut keys to my form

VB

Private Sub UserControl_KeyDown(ByVal sender As System.Object, ByVal e As System.Windows.Input.KeyEventArgs) Handles MyBase.KeyDown
        If e.Key = Key.F1 Then
            Button1_Click(sender, e)
        ElseIf e.Key = Key.F2 Then
            btnSaveF2_Click(sender, e)
        ElseIf e.Key = Key.F3 Then
            btnFindF3_Click(sender, e)
        ElseIf e.Key = Key.F4 Then
            btnEditF4_Click(sender, e)
        ElseIf e.Key = Key.F5 Then
            btnDeleteF5_Click(sender, e)
        ElseIf e.Key = Key.F7 Then
            btnCancelF7_Click(sender, e)
        ElseIf e.Key = Key.Escape Then
            btnExitEsc_Click(sender, e)
        End If

things are working fine but the problem is after the usercontrol loads once i have to click to any one of the button then only the keyboard shortcuts are working...

Please tell me what is the problem.

Posted 2-May-13 21:52pm

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KM Perumal 3-May-13 3:58am

Nice concept ...i try to find problem

1 solution

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Pheonyx · Answer 1 · 2013-05-02T22:12:00

Solution 1

When you load the UserControl set the focus to it. The Key Press event is a bubble event that travels from the currently focused control down the control tree. So if the user control is loaded but not has focus then a control beneath it will receive the key press bypassing it.

At least based on the theory behind it all that is what happens.

Also, I think you should look at the "PreviewKeyDown" event rather than the KeyDown event because as soon as something uses the KeyDown it stops bubbling where as PreviewKeyDown I believe continues to bubble unless you cancel it in the event args. Was slighlty wrong here, but have a read of this to understand routed events in WPF

http://joshsmithonwpf.wordpress.com/2007/06/22/overview-of-routed-events-in-wpf/[^]

Posted 2-May-13 22:12pm

Pheonyx

Updated 2-May-13 22:24pm

v3

Comments

[no name] 3-May-13 4:24am

how to do that...

Pheonyx 3-May-13 4:26am

How do you load your user control?

[no name] 3-May-13 4:27am

i have a home page where i gave the link for the user control..

Pheonyx 3-May-13 4:38am

What code do you use to load it? Is it embedded within a grid, when you say home page is this a web application?

[no name] 3-May-13 5:24am

No i have taken a menu in which i gave the links for each user controls..

Pheonyx 3-May-13 5:39am

Seriously, I will ask again... can you give a code example of what you are currently doing to load the user control.

[no name] 3-May-13 5:53am

UserContent1.Content = New Transportation

Pheonyx 3-May-13 6:01am

Have a read here, it sounds like they are doing something similar.

http://stackoverflow.com/questions/9535784/setting-default-keyboard-focus-on-loading-a-usercontrol

[no name] 3-May-13 6:14am

can u tell me how to set focus on a textbox while load

Pheonyx 3-May-13 6:16am

controlname.focus(); is normally how you do it. where controlname is the name of the control you want to set the focus to.

[no name] 3-May-13 6:20am

controlname.focus()is not working..
i tried FocusManager.SetFocusedElement(Me, txtName) but this is also not working

Pheonyx 3-May-13 6:34am

At this point, without knowing a lot more about your system I'm not sure I can help any further I'm afraid, sorry about that.