无法隐藏和显示窗口小部件以响应事件

我有一个问题，其中通过gtk_widget_hide_on_delete用delete事件关闭小部件时，无法通过交换的gtk_widget_show_all并将相应的小部件作为参数传递给菜单小部件，再次显示菜单小部件。

我是Gtk + 3的新手，要学习它，我正在创建一个简单的程序，该程序由带有多个按钮小部件的选择菜单组成。按下一个将隐藏菜单，并显示一个包含标签和TextEntry的窗口小部件，此窗口小部件的delete事件将隐藏该小部件，然后再次显示菜单。

我创建了此代码的最小示例。简单的c文件会加载一个XML文件，其中包含显示和隐藏小部件所需的所有函数调用。

我依靠gtk_widget_show_all，gtk_widget_hide和gtk_widget_hide_on_delete，但是当我使用删除事件关闭运动小部件时，窗口消失了，但是菜单小部件没有显示。

C代码简单地加载XML文件，显示菜单小部件并进入主gtk循环。

#include <gtk/gtk.h>
#include <stdio.h>

int main(int argc, char **argv)
{
    GtkBuilder * builder;
    GtkWidget * menu;
    GError *error = NULL;

    gtk_init(&argc, &argv);
    builder = gtk_builder_new();
    if (!gtk_builder_add_from_file(builder, "example.glade", &error)) {
        g_warning("%s", error->message);
        g_free(error);
        fprintf(stderr, "Failed to load build file");
    }

    menu = (GtkWidget *) gtk_builder_get_object(builder, "menu");

    gtk_builder_connect_signals(builder, NULL);
    gtk_widget_show(menu);

    gtk_main();

    return 0;
}

XML文件example.glade已使用Glade创建。

<?xml version="1.0" encoding="UTF-8"?>
<!-- Generated with glade 3.16.1 -->
<interface>
  <requires lib="gtk+" version="3.10"/>
  <object class="GtkWindow" id="exercise">
    <property name="can_focus">False</property>
    <property name="window_position">center</property>
    <signal name="delete-event" handler="gtk_widget_hide_on_delete" swapped="no"/>
    <signal name="delete-event" handler="gtk_widget_show_all" object="menu" after="yes" swapped="yes"/>
    <child>
      <object class="GtkGrid" id="grid2">
        <property name="visible">True</property>
        <property name="can_focus">False</property>
        <child>
          <object class="GtkEntry" id="entry1">
            <property name="visible">True</property>
            <property name="can_focus">True</property>
            <property name="hexpand">True</property>
          </object>
          <packing>
            <property name="left_attach">0</property>
            <property name="top_attach">1</property>
            <property name="width">1</property>
            <property name="height">1</property>
          </packing>
        </child>
        <child>
          <object class="GtkLabel" id="label1">
            <property name="visible">True</property>
            <property name="can_focus">False</property>
            <property name="hexpand">True</property>
            <property name="vexpand">True</property>
            <property name="label" translatable="yes">A window where stuff will happen.</property>
          </object>
          <packing>
            <property name="left_attach">0</property>
            <property name="top_attach">0</property>
            <property name="width">1</property>
            <property name="height">1</property>
          </packing>
        </child>
      </object>
    </child>
  </object>
  <object class="GtkWindow" id="menu">
    <property name="can_focus">False</property>
    <property name="window_position">center</property>
    <signal name="destroy" handler="gtk_main_quit" swapped="no"/>
    <child>
      <object class="GtkGrid" id="grid1">
        <property name="visible">True</property>
        <property name="can_focus">False</property>
        <child>
          <object class="GtkButton" id="button1">
            <property name="label" translatable="yes">button1</property>
            <property name="visible">True</property>
            <property name="can_focus">True</property>
            <property name="receives_default">True</property>
            <property name="hexpand">True</property>
            <property name="vexpand">True</property>
            <signal name="clicked" handler="gtk_widget_hide" object="menu" swapped="yes"/>
            <signal name="clicked" handler="gtk_widget_show_all" object="exercise" swapped="yes"/>
          </object>
          <packing>
            <property name="left_attach">0</property>
            <property name="top_attach">0</property>
            <property name="width">1</property>
            <property name="height">1</property>
          </packing>
        </child>
        <child>
          <object class="GtkButton" id="button2">
            <property name="label" translatable="yes">button2</property>
            <property name="visible">True</property>
            <property name="can_focus">True</property>
            <property name="receives_default">True</property>
            <property name="hexpand">True</property>
            <property name="vexpand">True</property>
            <signal name="clicked" handler="gtk_widget_hide" object="menu" swapped="yes"/>
            <signal name="clicked" handler="gtk_widget_show_all" object="exercise" swapped="yes"/>
          </object>
          <packing>
            <property name="left_attach">0</property>
            <property name="top_attach">1</property>
            <property name="width">1</property>
            <property name="height">1</property>
          </packing>
        </child>
      </object>
    </child>
  </object>
</interface>