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Change VK_Left press key action into my VCL

Posted on 2004-04-21
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Last Modified: 2008-03-03
I have a VCL derived from TCutomControl. When I press VK_UP, VK_Down, VL_Left or VK_Right the result is that my VCL change his focus and jump to next control. What to do to use these keys into my VCL and not to change the focus? I have tried untill now into keypress but no result.
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Question by:ginsonic
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3 Comments
 
LVL 11

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shaneholmes earned 500 total points
ID: 10885502
You need to handle the wm_GetDlgCode message as shown below:

TMyCustomControl = class(TCustomControl)
private
 { Private declarations }
 procedure WMGetDlgCode(var Message: TWMGetDlgCode); message WM_GETDLGCODE;
 end;


procedure TMyCustomControl.WMGetDlgCode( var Msg: TWMGetDlgCode );
begin
  inherited;
  Msg.Result := dlgc_WantArrows;   // Control will handle arrow keys
end;


You need to ensure that your control can receive the focus. Descending
from TCustomControl is the first step, which you've done. The next step is
publishing the TabStop & TabOrder properties, so users can navigate to your control
with the keyboard. The third step is calling SetFocus in the MouseDown
method.

Just add the TabStop- and TabOrder-property to the published section
of your control and in the constructor you assign true to the
TabStop-property.


Shane
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LVL 9

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by:ginsonic
ID: 10889066
Thanks for support! Work now :)
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LVL 11

Expert Comment

by:shaneholmes
ID: 10889096
<SMILE>
Your Welcome!

Shane
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