Savoir lorsqu'un TForm passe à wsMaximized ou wsMinimized

private
procedure WMSysCommand( var Msg: TWMSysCommand);message WM_SYSCOMMAND;

{...}

implementation

{...}

procedure TForm1.WMSysCommand( var Msg: TWMSysCommand);
begin
if (Msg.CmdType = SC_MINIMIZE) then
ShowMessage('Minimize')
else
if (Msg.CmdType = SC_MAXIMIZE) then
ShowMessage('Maximize');
DefaultHandler(Msg);
end;