设置GTK +条目或标签的文本不起作用

Question

我只是试图更改文本内容窗口小部件中的文本内容窗口小部件中的输入。我使用Glade来设计这个简单的界面，在窗口中只包含这两个小部件。然后将其转换为GIO资源，并将其加载到程序中glib-compile-resources test.xml。

但标签不变。任何想法我做错了什么？编译器不会给出任何警告。我可以打印标签的内容，也是我从Glade设置的内容。

test.c的

#include <gtk/gtk.h> 

static void on_entry_activate(GtkWidget *entry, gpointer data) { 
    const gchar *text = gtk_entry_get_text(GTK_ENTRY(entry)); 
    GtkBuilder *app_builder = gtk_builder_new_from_resource(
           "/org/samik/test/test.glade"); 
    GObject *label = gtk_builder_get_object(app_builder, "label1"); 
    g_print("%s\n", gtk_label_get_text(GTK_LABEL(label))); 
    gtk_label_set_text(GTK_LABEL(label), text); 
} 
static void on_app_activate(GApplication *app, gpointer data) { 
    GError *res_load_err = NULL; 
    GResource *app_res = g_resource_load("test.gresource", &res_load_err); 
    g_resources_register(app_res); 
    GtkBuilder *app_builder = gtk_builder_new_from_resource(
           "/org/samik/test/test.glade"); 
    GObject *entry = gtk_builder_get_object(app_builder, "entry1"); 
    GObject *main_window = gtk_builder_get_object(app_builder, "window1"); 
    g_signal_connect(GTK_WIDGET(entry), "activate", 
     G_CALLBACK(on_entry_activate), NULL); 
    gtk_window_set_application(GTK_WINDOW(main_window), GTK_APPLICATION(app)); 
    gtk_widget_show_all(GTK_WIDGET(main_window)); 
} 
int main(int argc, char *argv[]) { 
    int status; 

    GtkApplication *app = gtk_application_new("org.samik.draw", 
          G_APPLICATION_FLAGS_NONE); 
    g_signal_connect(app, "activate", G_CALLBACK(on_app_activate), NULL); 
    status = g_application_run(G_APPLICATION(app), argc, argv); 

    g_object_unref(app); 

    return status; 
} 

test.glade

<?xml version="1.0" encoding="UTF-8"?> 
<!-- Generated with glade 3.16.1 --> 
<interface> 
    <requires lib="gtk+" version="3.10"/> 
    <object class="GtkWindow" id="window1"> 
    <property name="can_focus">False</property> 
    <property name="title" translatable="yes">test</property> 
    <child> 
     <object class="GtkFixed" id="fixed1"> 
     <property name="visible">True</property> 
     <property name="can_focus">False</property> 
     <child> 
     <!-- take whatever user types in this text-entry --> 
      <object class="GtkEntry" id="entry1"> 
      <property name="width_request">100</property> 
      <property name="height_request">80</property> 
      <property name="visible">True</property> 
      <property name="can_focus">True</property> 
      </object> 
      <packing> 
      <property name="x">197</property> 
      <property name="y">119</property> 
      </packing> 
     </child> 
     <child> 
      <!-- and put it here --> 
      <object class="GtkLabel" id="label1"> 
      <property name="width_request">100</property> 
      <property name="height_request">80</property> 
      <property name="visible">True</property> 
      <property name="can_focus">False</property> 
      <property name="label" translatable="yes">label</property> 
      </object> 
      <packing> 
      <property name="x">53</property> 
      <property name="y">56</property> 
      </packing> 
     </child> 
     </object> 
    </child> 
    </object> 
</interface> 

的test.xml

<?xml version="1.0" encoding="UTF-8"?> 
<gresources> 
    <gresource prefix="/org/samik/test"> 
     <file compressed="true">test.glade</file> 
    </gresource> 
</gresources> 

Answer 1

当你调用gtk_builder_new_from_resource()两次，你基本上创建两个窗口（但只显示一个）。修改标签的调用是正确的，但它会修改不可见窗口中的标签。

只在初始化时加载资源一次，并为指向实际小部件的指针提供回调函数。通常，您会创建一个指向后面需要的所有小部件的指针的结构，然后将指向该结构的指针作为userdata传递给像on_entry_activate()这样的回调函数。