RE: Could GtkLayout be contained within GtkLayout??

["driverking" <driverking pchome com tw>]

Thanks for your replication. 

I wrote a test program for GtkLayout contained within another GtkLayout. 
The size of inner GtkLayout is 300x180. I split the inner GtkLayout up into
4 equal pieces (their size are 150x90). Then I create 4 GtkLayout widgets,
each contains a single button, to fill in the inner GtkLayout. When the test
program begins running, there isn't any button widget displayed. What's the 
problem with my code??
=====================Code Begin=============================
#include <gtk/gtk.h>

gint main(int argc, char* argv[])
{
  
  GtkWidget* window;
  GtkWidget* main_layout;
  GtkWidget* layout;
  GtkWidget* button;
  GtkAdjustment *hadj, *vadj;
  gint i, j, x = 0, y =0, x1 = 60, y1 = 30;
  gchar l[23];

  gtk_init(&argc, &argv);

  window = gtk_window_new( GTK_WINDOW_TOPLEVEL );
  gtk_window_set_default_size(GTK_WINDOW(window), 300, 180);
  
  hadj = (GtkAdjustment *)gtk_adjustment_new(0,0,300,0,0,0);
  vadj = (GtkAdjustment *)gtk_adjustment_new(0,0,180,0,0,0);

  main_layout = gtk_layout_new(hadj, vadj);
  gtk_layout_set_size(GTK_LAYOUT(main_layout), 300, 180);

  hadj = (GtkAdjustment *)gtk_adjustment_new(0,0,150,0,0,0);
  vadj = (GtkAdjustment *)gtk_adjustment_new(0,0,90,0,0,0);

  for( i=0; i<2; i++ ) { 
    for( j=0; j<2; j++) {
      layout = gtk_layout_new(hadj, vadj);
      gtk_layout_set_size(GTK_LAYOUT(layout), 150, 90);
      sprintf(l, "(%d, %d)", i, j);
      button = gtk_button_new_with_label(l);
      gtk_layout_put(GTK_LAYOUT(layout), button, x1, y1);
      gtk_layout_put(GTK_LAYOUT(main_layout), layout, x, y);
      x1 += 150;
      x += 150; 
    }
    x1 = 60;
    y1 += 90;
    x = 0;
    y +=90;  
  }

  gtk_container_add(GTK_CONTAINER(window), main_layout);
  gtk_widget_show_all(window);

  gtk_main();
  return 0;
}
=====================Code End===========================
> From: jrb redhat com [mailto:jrb redhat com]
> Subject: Re: Could GtkLayout be contained within GtkLayout??
>
> > Hi,
> >
> > Is it possible to make outer GtkLayout contained within inner 
> GtkLayout widget?
> > I need a container widget which is like the Panel component in Java.
> > This container widget can contain another container widget 
> provided with its location
> > coordinate with respect to its parent container. 
>
> Yes, GtkLayouts can contain any widget, including another GtkLayout.  I
> don't know if it's worth bringing up the usual warnings about absolute
> placement of widgets in this case.