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+ <h4 class="subsection">Menus and the Mouse</h4> <p>The usual way to make a menu keymap produce a menu is to make it the definition of a prefix key. (A Lisp program can explicitly pop up a menu and receive the user’s choice—see <a href="pop_002dup-menus">Pop-Up Menus</a>.) </p> <p>If the prefix key ends with a mouse event, Emacs handles the menu keymap by popping up a visible menu, so that the user can select a choice with the mouse. When the user clicks on a menu item, the event generated is whatever character or symbol has the binding that brought about that menu item. (A menu item may generate a series of events if the menu has multiple levels or comes from the menu bar.) </p> <p>It’s often best to use a button-down event to trigger the menu. Then the user can select a menu item by releasing the button. </p>  <p>If the menu keymap contains a binding to a nested keymap, the nested keymap specifies a <em>submenu</em>. There will be a menu item, labeled by the nested keymap’s item string, and clicking on this item automatically pops up the specified submenu. As a special exception, if the menu keymap contains a single nested keymap and no other menu items, the menu shows the contents of the nested keymap directly, not as a submenu. </p> <p>However, if Emacs is compiled without X toolkit support, or on text terminals, submenus are not supported. Each nested keymap is shown as a menu item, but clicking on it does not automatically pop up the submenu. If you wish to imitate the effect of submenus, you can do that by giving a nested keymap an item string which starts with ‘<samp>@</samp>’. This causes Emacs to display the nested keymap using a separate <em>menu pane</em>; the rest of the item string after the ‘<samp>@</samp>’ is the pane label. If Emacs is compiled without X toolkit support, or if a menu is displayed on a text terminal, menu panes are not used; in that case, a ‘<samp>@</samp>’ at the beginning of an item string is omitted when the menu label is displayed, and has no other effect. </p><div class="_attribution">
+  <p class="_attribution-p">
+    Copyright &copy; 1990-1996, 1998-2022 Free Software Foundation, Inc. <br>Licensed under the GNU GPL license.<br>
+    <a href="https://www.gnu.org/software/emacs/manual/html_node/elisp/Mouse-Menus.html" class="_attribution-link">https://www.gnu.org/software/emacs/manual/html_node/elisp/Mouse-Menus.html</a>
+  </p>
+</div>