子菜单级别的 GtkMenu 无法在 ubuntu 20.04 中引发 'active' 信号

Question

最近，我将我的代码从 ubuntu 14.04 升级到 20.04。 UI 似乎工作正常，但带有触摸屏的子菜单。我按下菜单，然后 select menuitem2 显示了子菜单，当我点击触摸屏打开子菜单时，它没有反应。

我写了一个代码来检查，发现当我点击触摸屏时发送的是 'select' 而不是 'active' 信号。（使用鼠标单击时代码工作正常）有谁能帮我解决这个问题吗？或者有任何其他 GtkWidget 可以用来替换 GtkMenu 吗？

如有任何意见和建议，我们将不胜感激。

Brlow 是我的代码：

/* 
 * Build:
 * gcc $(pkg-config --cflags gtk+-3.0) popover_sample.c -o popover_sample $(pkg-config --libs gtk+-3.0)
 */

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


void on_ITEM2_activate(GtkMenuItem* button, gpointer user_data)
{
    printf("on_ITEM2_activate \n");
}

void on_SEC_2_activate(GtkMenuItem* button, gpointer user_data)
{
    printf("on_SEC_2_activate \n");
}


void on_SEC_1_activate(GtkMenuItem* button, gpointer user_data)
{
    printf("on_SEC_1_activate \n");
}

void on_submenuitem1_activate(GtkMenuItem* button, gpointer user_data)
{
    printf("on_submenuitem1_activate \n");
}

void on_submenuitem2_activate(GtkMenuItem* button, gpointer user_data)
{
    printf("on_submenuitem2_activate \n");
}


void on_submenuitem3_activate(GtkMenuItem* button, gpointer user_data)
{
    printf("on_submenuitem3_activate \n");
}

void on_submenuitem4_activate(GtkMenuItem* button, gpointer user_data)
{
    printf("on_submenuitem4_activate \n");
}


// called when window is closed
void on_QUIT_BTN_clicked()
{
    gtk_main_quit();
}


void on_btn1_clicked(GtkMenuItem* button, gpointer user_data)
{
    gtk_main_quit();
}

void on_ITEM1_activate(GtkMenuItem* button, gpointer user_data)
{
    GtkWidget *open_item;   // New menuitem
    GtkWidget *save_item;   // New menuitem
    GtkWidget *quit_item;   // New menuitem
    GtkWidget *sep;      // New sep
    GtkWidget *ITEM1_Menu;  // New menu

    ITEM1_Menu = gtk_menu_new();

    open_item = gtk_menu_item_new_with_label ("Open");
    save_item = gtk_menu_item_new_with_label ("Save");
    quit_item = gtk_menu_item_new_with_label ("Quit");
    sep = gtk_separator_menu_item_new();

    gtk_menu_item_set_submenu(GTK_MENU_ITEM(button), ITEM1_Menu);
    gtk_menu_shell_append(GTK_MENU_SHELL(ITEM1_Menu), open_item);
    gtk_menu_shell_append(GTK_MENU_SHELL(ITEM1_Menu), save_item);
    gtk_menu_shell_append(GTK_MENU_SHELL(ITEM1_Menu), sep);
    gtk_menu_shell_append(GTK_MENU_SHELL(ITEM1_Menu), quit_item);


    g_signal_connect_swapped (G_OBJECT (open_item), "activate",
                              G_CALLBACK (on_submenuitem1_activate),
                              NULL);
    g_signal_connect_swapped (G_OBJECT (save_item), "activate",
                              G_CALLBACK (on_submenuitem2_activate),
                              NULL);

    g_signal_connect_swapped (G_OBJECT (quit_item), "activate",
                              G_CALLBACK (on_QUIT_BTN_clicked),
                              NULL);

    gtk_widget_show (open_item);
    gtk_widget_show (save_item);
    gtk_widget_show (quit_item);
    gtk_widget_show (sep);

    printf("on_ITEM1_activate \n");
}



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

    gtk_init(&argc, &argv);

    builder = gtk_builder_new();

    if (gtk_builder_add_from_file (builder, "Menu_Test.glade", &error) == 0)
    {
        printf("Unable to open file named \"Menu_Test.glade\" \n");
        return 1;
    }

    window = GTK_WIDGET(gtk_builder_get_object(builder, "test_win"));
    if (NULL == window)
    {
        printf("Unable to file object with id \"test_win\" \n");
    }

    g_signal_connect (window, "destroy", G_CALLBACK (gtk_main_quit), NULL);
    window = GTK_WIDGET(gtk_builder_get_object(builder, "test_win"));
    

    gtk_builder_connect_signals(builder, NULL);
    g_object_unref(builder);
    gtk_widget_show_all(window);
    gtk_main();

    return 0;
}

和空地如下：

<?xml version="1.0" encoding="UTF-8"?>
<!-- Generated with glade 3.38.2 -->
<interface>
  <requires lib="gtk+" version="3.24"/>
  <object class="GtkMenu" id="menu1">
    <property name="visible">True</property>
    <property name="can-focus">False</property>
    <child>
      <object class="GtkMenuItem" id="menuitem1">
        <property name="visible">True</property>
        <property name="can-focus">False</property>
        <property name="tooltip-text" translatable="yes">ITEM_1</property>
        <property name="label" translatable="yes">menuitem1</property>
        <property name="use-underline">True</property>
        <signal name="select" handler="on_ITEM1_activate" swapped="no"/>
      </object>
    </child>
    <child>
      <object class="GtkMenuItem" id="menuitem2">
        <property name="visible">True</property>
        <property name="can-focus">False</property>
        <property name="tooltip-text" translatable="yes">ITEM_2</property>
        <property name="label" translatable="yes">menuitem2</property>
        <property name="use-underline">True</property>
        <signal name="activate" handler="on_ITEM2_activate" swapped="no"/>
        <child type="submenu">
          <object class="GtkMenu" id="menu2">
            <property name="visible">True</property>
            <property name="can-focus">False</property>
            <child>
              <object class="GtkMenuItem" id="submenuitem3">
                <property name="visible">True</property>
                <property name="can-focus">False</property>
                <property name="tooltip-text" translatable="yes">Item_2_1</property>
                <property name="label" translatable="yes">menuitem3</property>
                <property name="use-underline">True</property>
                <signal name="activate" handler="on_submenuitem3_activate" swapped="no"/>
              </object>
            </child>
            <child>
              <object class="GtkMenuItem" id="submenuitem4">
                <property name="name">submenuitem4</property>
                <property name="visible">True</property>
                <property name="can-focus">False</property>
                <property name="tooltip-text" translatable="yes">Item_2_2</property>
                <property name="label" translatable="yes">menuitem4</property>
                <property name="use-underline">True</property>
                <signal name="activate" handler="on_submenuitem4_activate" swapped="no"/>
              </object>
            </child>
          </object>
        </child>
      </object>
    </child>
  </object>
  <object class="GtkWindow" id="test_win">
    <property name="width-request">300</property>
    <property name="height-request">300</property>
    <property name="can-focus">False</property>
    <child>
      <object class="GtkBox" id="box1">
        <property name="visible">True</property>
        <property name="can-focus">False</property>
        <property name="orientation">vertical</property>
        <property name="spacing">76</property>
        <child>
          <object class="GtkMenuButton" id="menubutton1">
            <property name="visible">True</property>
            <property name="can-focus">True</property>
            <property name="receives-default">True</property>
            <property name="popup">menu1</property>
            <child>
              <placeholder/>
            </child>
          </object>
          <packing>
            <property name="expand">False</property>
            <property name="fill">True</property>
            <property name="position">0</property>
          </packing>
        </child>
        <child>
          <placeholder/>
        </child>
        <child>
          <object class="GtkButton" id="button1">
            <property name="label" translatable="yes">button</property>
            <property name="visible">True</property>
            <property name="can-focus">True</property>
            <property name="receives-default">True</property>
            <property name="halign">center</property>
            <property name="valign">baseline</property>
            <signal name="clicked" handler="on_QUIT_BTN_clicked" swapped="no"/>
          </object>
          <packing>
            <property name="expand">False</property>
            <property name="fill">True</property>
            <property name="position">2</property>
          </packing>
        </child>
      </object>
    </child>
  </object>
</interface>

Answer 1

将 gtk 库升级到 3.24.28 版本后。这个问题已经解决了。

子菜单级别的 GtkMenu 无法在 ubuntu 20.04 中引发 'active' 信号

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