# racket-tray

A small system tray API for Racket.

Version 0.1 implements Windows directly through the Win32 API. It uses the
native `HWND` of an existing Racket `frame%`/`dialog%`, `Shell_NotifyIconW`, and
`SetWindowSubclass`. No additional native DLL is required.

```racket
#lang racket/gui

(require racket-tray)

(define frame
  (new frame%
       [label "Tray example"]
       [width 400]
       [height 250]))

(define tray
  (mk-tray frame
           "example.png"
           (λ ()
             (send frame show #t))))

(tray-set-menu!
 tray
 (list
  (list "Open"
        (λ () (send frame show #t)))
  'separator
  (list "Exit"
        (λ ()
          (tray-close tray)
          (send frame show #f)))))

(send frame show #t)
```

`mk-tray` and `tray-set-icon!` accept both Windows `.ico` files and `.png`
files. PNG transparency is preserved when the image is converted to the native
Windows tray icon.

`tray-set-menu!` also accepts a `popup-menu%` object directly, or `#f` to
remove the context menu.

At the moment non-Windows platforms report that the operation is unsupported.