子菜单级别的 GtkMenu 无法在 ubuntu 20.04 中引发“活动”信号
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【中文标题】子菜单级别的 GtkMenu 无法在 ubuntu 20.04 中引发“活动”信号【英文标题】：GtkMenu in Sub-menu level cannot raise 'active' signal in ubuntu 20.04 【发布时间】：2021-07-10 07:56:29 【问题描述】：最近，我将代码从 ubuntu 14.04 升级到 20.04。 UI 似乎工作正常，但带有触摸面板的子菜单。 我按下菜单并选择 menuitem2 并显示子菜单， 当我点击触摸屏打开子菜单时，它没有响应。
我编写了一个代码进行检查，发现当我点击触摸屏时发送了“选择”信号而不是“活动”信号。 （使用鼠标单击时代码工作正常） 有人可以帮我解决这个问题吗？或者有任何其他 GtkWidget 可以用来代替 GtkMenu？
任何 cmets 和建议将不胜感激。
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;
和下面的空地：
<?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>
【问题讨论】：
我缝了一个触摸屏补丁：gitlab.gnome.org/GNOME/gtk/-/merge_requests/1794 该补丁似乎与 GTK-3.24 兼容，但我使用的是 GTK-3.24.20。这仍然发生在我的触摸屏上 将 gtk lib 升级到 3.24.28 版本后。这个问题已经解决了。 【参考方案1】：将 gtk lib 升级到 3.24.28 版本后。这个问题已经解决了。
【讨论】：
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