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Detecting if form minimized

Posted on 1997-06-24
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Last Modified: 2010-04-03
Can anyone tell me how to detect if a form is minimized?  I cannot find any info on this at all.

Ok.  I already had a procedure OnResize, but when the minimize button is pressed, the program does not even trace to this procedure.

I know the OnResize procedure is working, because if the window is moved, this procedure is called perfectly.

I need to know if there is an API which detects when the minimize button is pressed.

Any help would be appreciated.

Stuart
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Question by:Stuart_Johnson
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CFantin earned 50 total points
ID: 1337743
You can Check the if the WindowState property is wsMinimized.
This property is updated when you form state is changed.
Therefore you can check if the form is Maximized or normal as well with the wsMaximized and wsNormal.

Hope this helps
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by:Stuart_Johnson
ID: 1337744
Edited text of question
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Expert Comment

by:CFantin
ID: 1337745
Here is a bit of code to detect the Minimize, Maximize and restore of a form.

The windows message WM_SYSCOMMAND is captured as well as creating
a message handler for the application.
The message handler for the form needs to be there because when the user right clicks the application button in 95 the windows message for the form is not created but instead the windows message is sent to the application.

unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,
  WINTYPES, WINPROCS, StdCtrls;

type
  TForm1 = class(TForm)
    Label1: TLabel;
    procedure FormCreate(Sender: TObject);
  private
    procedure WMSIZE(var Msg: TMessage); message WM_SYSCOMMAND;
    procedure MyMessage(var Msg: TMSG; var Handled: Boolean);
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.DFM}

procedure TForm1.WMSIZE(var Msg: TMessage);
begin
  inherited;

  case Msg.WParam of
    SC_MINIMIZE: ShowMessage('Minimize');
    SC_MAXIMIZE: ShowMessage('Maximize');
    SC_RESTORE: ShowMessage('Restore');
  end;
end;

procedure TForm1.MyMessage(var Msg: TMsg; var Handled: Boolean);
begin
  if (Msg.Message = WM_SYSCOMMAND) then
  begin
    case Msg.wParam of
      SC_MINIMIZE: ShowMessage('Minimize');
      SC_MAXIMIZE: ShowMessage('Maximize');
      SC_RESTORE: ShowMessage('Restore');
    end;
  end;
end;

procedure TForm1.FormCreate(Sender: TObject);
begin
  Application.OnMessage := MyMessage;
end;

end.

Try this out...

Good luck
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