explorer: Add a generic handler for desktop notifications.

programs/explorer/desktop.c

@@ -636,7 +636,7 @@ static LRESULT WINAPI desktop_wnd_proc( HWND hwnd, UINT message, WPARAM wp, LPAR
         return 0;
 
     case WM_PARENTNOTIFY:
-        if (LOWORD(wp) == WM_DESTROY) cleanup_systray_window( (HWND)lp );
+        handle_parent_notify( (HWND)lp, wp );
         return 0;
 
     case WM_LBUTTONDBLCLK:

programs/explorer/explorer_private.h

@@ -24,7 +24,7 @@
 extern void manage_desktop( WCHAR *arg ) DECLSPEC_HIDDEN;
 extern void initialize_systray( HMODULE graphics_driver, BOOL using_root, BOOL enable_shell ) DECLSPEC_HIDDEN;
 extern void initialize_appbar(void) DECLSPEC_HIDDEN;
-extern void cleanup_systray_window( HWND hwnd ) DECLSPEC_HIDDEN;
+extern void handle_parent_notify( HWND hwnd, WPARAM wp ) DECLSPEC_HIDDEN;
 extern void do_startmenu( HWND owner ) DECLSPEC_HIDDEN;
 extern LRESULT menu_wndproc(HWND hwnd, UINT msg, WPARAM wparam, LPARAM lparam) DECLSPEC_HIDDEN;
 

programs/explorer/systray.c

@@ -447,7 +447,7 @@ static BOOL delete_icon(struct icon *icon)
 }
 
 /* cleanup icons belonging to a window that has been destroyed */
-void cleanup_systray_window( HWND hwnd )
+static void cleanup_systray_window( HWND hwnd )
 {
     struct icon *icon, *next;
 
@@ -680,6 +680,17 @@ static LRESULT WINAPI tray_wndproc( HWND hwnd, UINT msg, WPARAM wparam, LPARAM l
     return 0;
 }
 
+/* notifcation posted to the desktop window */
+void handle_parent_notify( HWND hwnd, WPARAM wp )
+{
+    switch (LOWORD(wp))
+    {
+    case WM_DESTROY:
+        cleanup_systray_window( hwnd );
+        break;
+    }
+}
+
 /* this function creates the listener window */
 void initialize_systray( HMODULE graphics_driver, BOOL using_root, BOOL arg_enable_shell )
 {