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Tab key

Posted on 1999-06-30
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Last Modified: 2008-03-10
How to intercept a Tab Key for a listbox and Textbox controls? KeyPress, KeyDown and KeyUp events do not recognize Tab key at all.
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Question by:burevestnik
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5 Comments
 

Accepted Solution

by:
jlowrance earned 300 total points
ID: 1521122
If no control on the form can accept focus from a tab keypress, then a KeyDown and KeyPress event will be generated.

Try this - create code in the GotFocus event of the textbox and listbox to set the TabStop to False for all controls on the form, including themselves.  This will prevent the Tab from setting focus to another control.

Now you can check for a KeyAscii of 9 in the KeyPress event or a KeyCode of 9 in the KeyDown event.

After the Tab is detected, you can perform whatever you wish to do and also turn on the TabStop = True for all controls and then setfocus to whatever control you like.

Be sure that in the LostFocus event of the listbox and textbox that you turn on TabStop = True for all controls so that navigation is enabled again.
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Expert Comment

by:wpd
ID: 1521123
Or you can subclass the window and trap all events _before_ VB gets a chance to process and/or discard them. I'll tell you more if you're interested.
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Expert Comment

by:jlowrance
ID: 1521124
wpd - Yes, I'm interested.  Always have an ear open for learning...
Email me at jlowrance@usa.net if you wish to continue outside of this forum...
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LVL 2

Expert Comment

by:wpd
ID: 1521125
See below. Should add plenty of error checking and such, but this code will let you peek at all window messages before VB gets a chance to process them.
 
Const GWL_WNDPROC = -4

Declare Function CallWindowProc Lib "user32" Alias "CallWindowProcA" (ByVal lpFunc&, ByVal hWnd&, ByVal Msg&, ByVal wParam&, ByVal lParam&) as Long
Declare Function SetWindowLong Lib "user32" Alias "SetWindowLongA" (ByVal hWnd&, ByVal index&, ByVal dwNewLong&) as Long

Dim lSavWndProc as Long

Private Sub Form_Load()

' subclass the window
lSavWndProc = SetWindowLong(Me.hWnd, GWL_WNDPROC, AddressOf myWindowProc)

End Sub

Private Sub Form_Unload()

 ' remove the hook
 Call SetWindowLong (Me.hWnd, GWL_WNDPROC, lSavWndProc)

End Sub

' our custom window proc
Function myWindowProc(ByVal hWnd&, ByVal msg&, ByVal wParam&, ByVal lParam&) as Long

if msg = ... ' Test for the message that interests you
'... do something with it

' pass the message for normal processing
myWindowProc = CallWindowProc (lSavWndProc, hWnd, msg, wParam, lParam)

End Function

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Author Comment

by:burevestnik
ID: 1521126
I believe I found solution myself. I just had to change TabIndex property to do what I need to do. Thanks everyone who responded.
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