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The OnKeyPress event of an object allows you to check what key the user has pressed.
Note that this procedure handles printable characters only. Non-printable characters (e.g. control sequences) are handled by the OnKeyDown event.
Note: OnKeyPress doesn't support Unicode characters. If you need Unicode characters but no control characters, use OnUTF8KeyPress.
uses ...LCLType, Dialogs, ...; ... procedure TMainForm.FormKeyPress(Sender: TObject; var Key: char); begin case key of '0': ShowMessage('"0" key pressed'); '1': ShowMessage('"1" key pressed'); '2': ShowMessage('"2" key pressed'); end; Key := #0; // Necessary for some widgetsets, e.g. Cocoa, in order to disable processing in subsequent elements. end;
- LCL Key Handling Detailed background on key handling in the LCL.
- key down