Responding to a Mouse-down Action
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Whenever the user presses a button on the mouse, an Vcl.Controls.TControl.OnMouseDown event goes to the object the pointer is over. The object can then respond to the event.
To respond to a mouse-down action, attach an event handler to the OnMouseDown event.
The Code editor generates an empty handler for a mouse-down event on the form:
procedure TForm1.FormMouseDown(Sender: TObject; Button: TMouseButton;
Shift: TShiftState; X, Y: Integer);
begin
end;
void __fastcall TForm1::FormMouseDown(TObject *Sender, TMouseButton Button,
TShiftState Shift, int X, int Y) {
}