如何使GtkLayout滚动?

Question

我的问题与GtkLayout有关，我读过它负责用小部件创建无限可滚动区域。我用下面的代码创建了一个:

GtkWidget *window;
GtkWidget *button1;
GtkWidget *button2;
GtkWidget *layout;
window = gtk_application_window_new (app);
gtk_window_set_title (GTK_WINDOW (window), "Window wowowwow");
gtk_window_set_default_size (GTK_WINDOW (window), 200, 200);

layout = gtk_layout_new(NULL, NULL);
gtk_container_add (GTK_CONTAINER (window), layout);
button1 = gtk_button_new_with_label ("Hello World");
g_signal_connect (button1, "clicked", G_CALLBACK (print_hello), NULL);
g_signal_connect_swapped (button1, "clicked", G_CALLBACK (gtk_widget_destroy), window);
gtk_layout_put(GTK_LAYOUT(layout), button1, 20,20);
button2 = gtk_button_new_with_label ("Button 2");
g_signal_connect_swapped (button2, "clicked", G_CALLBACK (gtk_widget_destroy), button2);
gtk_layout_put(GTK_LAYOUT(layout), button2, 200,200);

GtkAdjustment *hadjustment = gtk_adjustment_new(0, 0, 1000, 1, 1, 20);
gtk_layout_set_size(GTK_LAYOUT(layout), 1000,1000);
gtk_scrollable_set_hadjustment(GTK_SCROLLABLE(layout), hadjustment);
gtk_widget_show_all (window);

显示如下窗口:

窗口初始

. .当调整大小时:

窗口大小

问题是，我希望GtkLayout的内容是可滚动的。我认为问题在于调整对象，我必须配置，但我不知道参数到底是什么意思，文档是非常稀缺的。所以，我期待着这里的帮助。

Answer 1

为了使其工作，我必须将GtkLayout放入GtkScrolledWindow中并覆盖布局的默认尺寸。工作代码如下所示:

#include <gtk/gtk.h>
static void
print_hello (GtkWidget *widget,
gpointer   data)
{
g_print ("Hello Worldn");
}
static void
activate (GtkApplication *app,
gpointer        user_data)
{
GtkWidget *window;
GtkWidget *scrolled_window;
GtkWidget *layout;
window = gtk_application_window_new (app);
gtk_window_set_title (GTK_WINDOW (window), "Window");
gtk_window_set_default_size (GTK_WINDOW (window), 200, 200);
scrolled_window = gtk_scrolled_window_new(NULL, NULL);
gtk_container_add (GTK_CONTAINER (window), scrolled_window);
layout = gtk_layout_new(NULL, NULL);
gtk_container_add(GTK_CONTAINER(scrolled_window), layout);
int i = 0;
while (i < 10) {
GtkWidget *a_button;
a_button = gtk_button_new_with_label("Button");
gtk_layout_put(GTK_LAYOUT(layout), a_button, 10, 10 + 40 * i);
i += 1;
}
gtk_layout_set_size(GTK_LAYOUT(layout), 1000,1000);
gtk_widget_show_all (window);
}
int
main (int    argc,
char **argv)
{
GtkApplication *app;
int status;
app = gtk_application_new ("org.gtk.example", G_APPLICATION_FLAGS_NONE);
g_signal_connect (app, "activate", G_CALLBACK (activate), NULL);
status = g_application_run (G_APPLICATION (app), argc, argv);
g_object_unref (app);
return status;
}