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Frequently Asked Questions

responding when the user minimizes or maximizes a Form

Question:

How can I respond to the user minimizing or maximizing my form before the resizing actually takes place?

Answer:

The following example demonstrates trapping the Windows
WM_SYSCOMMAND message. If the command specifies to minimize or
maximize the form, we will beep the PC speaker instead;

Example:

type
  TForm1 = class(TForm)
  private
    { Private declarations }
    procedure WMSysCommand(var Msg: TWMSysCommand);
      message WM_SYSCOMMAND;
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.DFM}

procedure TForm1.WMSysCommand;
begin
  if (Msg.CmdType = SC_MINIMIZE) or
     (Msg.CmdType = SC_MAXIMIZE) then
    MessageBeep(0) else
  inherited;
end;

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