+DEFUN ("x-menu-bar-open-internal", Fx_menu_bar_open_internal, Sx_menu_bar_open_internal, 0, 1, "i",
+ doc: /* Start key navigation of the menu bar in FRAME.
+This initially opens the first menu bar item and you can then navigate with the
+arrow keys, select a menu entry with the return key or cancel with the
+escape key. If FRAME has no menu bar this function does nothing.
+
+If FRAME is nil or not given, use the selected frame. */)
+ (frame)
+ Lisp_Object frame;
+{
+ XEvent ev;
+ FRAME_PTR f = check_x_frame (frame);
+ Widget menubar;
+ BLOCK_INPUT;
+
+ if (FRAME_EXTERNAL_MENU_BAR (f))
+ set_frame_menubar (f, 0, 1);
+
+ menubar = FRAME_X_OUTPUT (f)->menubar_widget;
+ if (menubar)
+ {
+ Window child;
+ int error_p = 0;
+
+ x_catch_errors (FRAME_X_DISPLAY (f));
+ memset (&ev, 0, sizeof ev);
+ ev.xbutton.display = FRAME_X_DISPLAY (f);
+ ev.xbutton.window = XtWindow (menubar);
+ ev.xbutton.root = FRAME_X_DISPLAY_INFO (f)->root_window;
+ ev.xbutton.time = XtLastTimestampProcessed (FRAME_X_DISPLAY (f));
+ ev.xbutton.button = Button1;
+ ev.xbutton.x = ev.xbutton.y = FRAME_MENUBAR_HEIGHT (f) / 2;
+ ev.xbutton.same_screen = True;
+
+#ifdef USE_MOTIF
+ {
+ Arg al[2];
+ WidgetList list;
+ Cardinal nr;
+ XtSetArg (al[0], XtNchildren, &list);
+ XtSetArg (al[1], XtNnumChildren, &nr);
+ XtGetValues (menubar, al, 2);
+ ev.xbutton.window = XtWindow (list[0]);
+ }
+#endif
+
+ XTranslateCoordinates (FRAME_X_DISPLAY (f),
+ /* From-window, to-window. */
+ ev.xbutton.window, ev.xbutton.root,
+
+ /* From-position, to-position. */
+ ev.xbutton.x, ev.xbutton.y,
+ &ev.xbutton.x_root, &ev.xbutton.y_root,
+
+ /* Child of win. */
+ &child);
+ error_p = x_had_errors_p (FRAME_X_DISPLAY (f));
+ x_uncatch_errors ();
+
+ if (! error_p)
+ {
+ ev.type = ButtonPress;
+ ev.xbutton.state = 0;
+
+ XtDispatchEvent (&ev);
+ ev.xbutton.type = ButtonRelease;
+ ev.xbutton.state = Button1Mask;
+ XtDispatchEvent (&ev);
+ }
+ }
+
+ UNBLOCK_INPUT;
+
+ return Qnil;
+}