explorer: Add a start menu.

programs/explorer/Makefile.in

@@ -7,6 +7,7 @@ C_SRCS = \
 	appbar.c \
 	desktop.c \
 	explorer.c \
+	startmenu.c \
 	systray.c
 
 RC_SRCS = explorer.rc

programs/explorer/explorer_private.h

@@ -24,5 +24,7 @@
 extern void manage_desktop( WCHAR *arg );
 extern void initialize_systray( HMODULE graphics_driver, BOOL using_root );
 extern void initialize_appbar(void);
+extern void do_startmenu( HWND owner );
+extern LRESULT menu_wndproc(HWND hwnd, UINT msg, WPARAM wparam, LPARAM lparam);
 
 #endif  /* __WINE_EXPLORER_PRIVATE_H */

programs/explorer/systray.c

@@ -625,6 +625,15 @@ static LRESULT WINAPI tray_wndproc( HWND hwnd, UINT msg, WPARAM wparam, LPARAM l
         ShowWindow( hwnd, SW_HIDE );
         return 0;
 
+    case WM_COMMAND:
+        if ((HWND)lparam == start_button && HIWORD(wparam) == BN_CLICKED)
+            do_startmenu(hwnd);
+        break;
+
+    case WM_INITMENUPOPUP:
+    case WM_MENUCOMMAND:
+        return menu_wndproc(hwnd, msg, wparam, lparam);
+
     default:
         return DefWindowProcW( hwnd, msg, wparam, lparam );
     }