Changing icon in tray

Can someone make me a short demo of a plain form with one button that hides the form to the tray. That part is what I already can do. What I need more is that I want to change the icon on a timer. Let's say I want the icon change every second to a new one. How do I enclude the icons and how do I make the program change the icon while hidden in the tray.

Marcel (Holland)
LVL 1
mpootsAsked:
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intheConnect With a Mentor Commented:
const
  WM_MYTRAYICONCALLBACK = WM_USER + 1000;

type
  TForm1 = class(TForm)
    PopupMenu1 : TPopupMenu;
    Close1     : TMenuItem;
    Restore1   : TMenuItem;
    Timer1     : TTimer;
    procedure Close1Click(Sender: TObject);
    procedure Restore1Click(Sender: TObject);
    procedure FormCreate(Sender: TObject);
    procedure FormDestroy(Sender: TObject);
    procedure Timer1Timer(Sender: TObject);
  private
    { Private declarations }
    HIcon1, HIcon2 : HICON;
    MyTrayIcon: TNotifyIconData;
    procedure AppMinimize(Sender:TObject);
    procedure WMMyTrayIconCallback(var Msg:TMessage);
                       message WM_MYTRAYICONCALLBACK;
  public
    { Public declarations }
  end;

{...}

procedure TForm1.FormCreate(Sender: TObject);
begin
  { load our icons }
  HIcon1 := LoadIcon(0, IDI_WINLOGO);
  HIcon2 := LoadIcon(0, IDI_HAND);

  { set TApplictaion.OnMinimize to our new event }
  Application.OnMinimize := AppMinimize;

  { start our application minimized to the System Tray }
  Visible := FALSE;
  Application.ShowMainForm := Visible;

  { required to set cbSize to SizeOf our structure }
  MyTrayIcon.cbSize := SizeOf(TNotifyIconData);

  { handle to main window }
  MyTrayIcon.Wnd    := Handle;

  { identifier of our icon }
  MyTrayIcon.uId    := 1;

  { flags showing what we are using in the other members below }
  MyTrayIcon.uFlags := NIF_ICON or NIF_TIP or NIF_MESSAGE;

  { our user defined message }
  MyTrayIcon.uCallBackMessage := WM_MYTRAYICONCALLBACK;

  {  set our icon to the first one loaded above }
  MyTrayIcon.hIcon  := HIcon1;

  { help message of the icon }
  MyTrayIcon.szTip  := 'Lou''s Delphi Tip of the Day [MyTrayIcon]';

  { add our icon to the tray }
  Shell_NotifyIcon(NIM_ADD, @MyTrayIcon);
end;

procedure TForm1.FormDestroy(Sender: TObject);
begin
  { remove our icon from the tray }
  Shell_NotifyIcon(NIM_DELETE, @MyTrayIcon);
end;

procedure TForm1.AppMinimize(Sender:TObject);
begin
  { hide our application }
  Visible := FALSE;
  Application.ShowMainForm := Visible;
end;

procedure TForm1.WMMyTrayIconCallback(var Msg:TMessage);
var
  CursorPos : TPoint;
begin
  case Msg.lParam of
    WM_LBUTTONDOWN :
      begin
        { get mouse cursor position }
        GetCursorPos(CursorPos);
        { popup our TPopupMenu }
        PopupMenu1.Popup(CursorPos.X,CursorPos.Y);
      end;
  end;
end;

procedure TForm1.Close1Click(Sender: TObject);
begin
  { close our application }
  Close;
end;

procedure TForm1.Restore1Click(Sender: TObject);
begin
  { restore our application, or minimize if already
    in a restore mode }
  Visible := TRUE;
  Application.ShowMainForm := Visible;
  SetForegroundWindow(Application.Handle);
end;

procedure TForm1.Timer1Timer(Sender: TObject);
begin
  { change our icon to the opposite one loaded }
  if MyTrayIcon.hIcon = HIcon1 then
    MyTrayIcon.hIcon := HIcon2
  else
    MyTrayIcon.hIcon := HIcon1;

  { tell the SystemTray to modify our changes }
  Shell_NotifyIcon(NIM_MODIFY, @MyTrayIcon);
end;


you can put the icons in your res file and call them using
LoadIcon(Hinstance, IconName);


or you can always go to torrys and get a trayicon comp that will do it:
http://www.torry.net/trayicons.htm

0
 
Rob SiddellCommunity Educator IICommented:
listening..

Rob
0
 
DMNCommented:
Really you can use 3rd party component to do it. I wrote suach component som etime ago. If you wish I'll post it tomorrow.
0
 
mpootsAuthor Commented:
Perfect! Just what I needed..

Marcel (Holland)
0
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