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Arrow keys do not generate WM_KEYDOWN
2 comments. Current rating: 
(2 votes). Leave comments and/ or rate it.
Problem:
The KEYDOWN event does not get fired for the left/right arrow keys.
When placed on a form with more than one other control, the left and right arrow keys move the focus, instead of firing an event.
Solution:
You need to handle WM_GETDLGCODE to tell Windows what keyboard messages you want to process.
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// based on a contribution from David Rifkind <drifkind@acm.org> type TMyControl = class(TWinControl) private //.. procedure WMGetDlgCode(var message: TMessage); message WM_GETDLGCODE; //.. end; // request the arrow keys + characters procedure TMyControl.WMGetDlgCode(var message: TMessage); begin message.Result := DLGC_WANTARROWS or DLGC_WANTCHARS; end; | ||
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Comments:
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Very good tips ! helpful for Visual C++ MFC too !!
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