Title: Shift, Ctrl, Alt Key Checking
Question: Shift, Ctrl, Alt Key Checking
Answer:
function CtrlDown : Boolean;
var
State : TKeyboardState;
begin
GetKeyboardState(State);
Result := ((State[vk_Control] And 128) 0);
end;
function ShiftDown : Boolean;
var
State : TKeyboardState;
begin
GetKeyboardState(State);
Result := ((State[vk_Shift] and 128) 0);
end;
function AltDown : Boolean;
var
State : TKeyboardState;
begin
GetKeyboardState(State);
Result := ((State[vk_Menu] and 128) 0);
end;
{
The following example demonstrates checking if the
Shift key is pressed during a Button Click.
}
procedure TForm1.Button1Click(Sender: TObject);
begin
if ShiftDown then
Form1.Caption := 'Shift' else
Form1.Caption := 'No Shift';
end;