unit Hndltabu;
interface
uses
SysUtils, WinTypes, WinProcs, Messages, Classes, Graphics, Controls, Forms, Dialogs, StdCtrls;
type
(TForm)
Edit1: TEdit;
Edit2: TEdit;
Label1: TLabel;
procedure FormCreate(Sender: TObject);
private { Private-Deklarationen }
procedure AppMessage(var Msg: TMsg; var Handled: Boolean);
public { Public-Deklarationen }
end;
var
Form1: TForm1;
implementation
{$R *.DFM}
procedure TForm1.AppMessage(var Msg: TMsg; var Handled: Boolean);
const
shiftPressed: boolean = false;
begin
if Msg.Message = WM_KEYDOWN then
if not shiftPressed and (Msg.wParam = VK_SHIFT) then
begin
shiftPressed := true;
Exit;
end
else
begin
if Msg.wParam = VK_TAB then
if ActiveControl = Edit1 then begin
if shiftPressed then
Label1.Caption := 'BACKTAB!'
else
Label1.Caption := 'TAB!';
Handled := true
end
else
Label1.Caption := '';
shiftPressed := false;
end;
end;
procedure TForm1.FormCreate(Sender: TObject);
begin
Application.OnMessage := AppMessage;
end;
end.