How to draw lines in subwindows

[Elvir Hadzic <elvir Hadzic stud fh-hannover de>]

Hi all,

I created a main window with 2 subwindows, but i can't draw lines in the subwindow.
The drawing works only in main window. Can anybody help me ???
Are there other possibilities to create subwindows (what about GDK_WINDOW_CHILD)?
How can I set that the child windows are only moveable within the mainwindow ?

My source code :
 

#include <stdio.h>
#include <string.h>

#include "gdk/gdk.h"
#include "gtk/gtk.h"

/* ======================= Callback functions ========================== */

gint close_sub_win (GtkWidget * widget,gpointer daten)
{
   gtk_widget_destroy(widget);

   return (TRUE);
}

gint close_prog (GtkWidget * widget,GdkEvent * event, gpointer daten)
{
   gtk_main_quit();

   return (TRUE);
}

/*=======================  main function ============================== */

int main(int argc, char *argv[])
{
   GtkWidget * main_win,
                       * sub_win1,
                       * sub_win2;

   GdkColormap * palette;

   GdkRectangle  update_rect;

   GdkColor    color;

   GdkGC     * context;

   GtkStyle  * style;     /* window style */

   gtk_init(&argc,&argv);

/* ========================================================================== */

   main_win= gtk_window_new(GTK_WINDOW_TOPLEVEL);

   gtk_widget_set_app_paintable(main_win,TRUE);

   gtk_container_set_border_width (GTK_CONTAINER (main_win), 10);

   gtk_widget_set_usize(main_win,
                                           gdk_screen_width(),
                                           gdk_screen_height());

   gtk_window_set_policy (GTK_WINDOW(main_win),  FALSE,  FALSE,  FALSE);

   style = gtk_style_copy (gtk_widget_get_style(main_win));

   gdk_color_parse("blue",&color);

   style->bg[GTK_STATE_NORMAL]= color;

   gtk_widget_set_style (main_win,style);

   gtk_window_set_title (GTK_WINDOW(main_win),   "Hello");

   gtk_signal_connect(GTK_OBJECT(main_win),
                                       "delete_event",
                                        GTK_SIGNAL_FUNC(close_prog),
                                       NULL);

/* ========================= create sub windows=============================== */

   sub_win1= gtk_window_new(GTK_WINDOW_TOPLEVEL);

   gtk_signal_connect(GTK_OBJECT(sub_win1),
                                      "delete_event",
                                       GTK_SIGNAL_FUNC(close_sub_win),
                                       NULL);

   gtk_widget_set_usize(sub_win1,300,200);

   gtk_widget_set_uposition(sub_win1,50,50);

   gtk_widget_set_sensitive(sub_win1,FALSE);

   gtk_window_set_title (GTK_WINDOW(sub_win1), "Subwindow 1");

   gtk_window_set_policy (GTK_WINDOW(sub_win1), FALSE,   FALSE,  FALSE);

   gtk_window_set_transient_for (GTK_WINDOW(sub_win1), GTK_WINDOW(main_win));

   gtk_widget_set_app_paintable(sub_win1,TRUE);

/*===========================================================================*/

   sub_win2= gtk_window_new(GTK_WINDOW_TOPLEVEL);

   gtk_signal_connect(GTK_OBJECT(sub_win2),
                                        "delete_event",
                                        GTK_SIGNAL_FUNC(close_sub_win),
                                        NULL);

   gtk_widget_set_usize(sub_win2,300,200);

   gtk_widget_set_uposition(sub_win2,450,50);

   gtk_widget_set_sensitive(sub_win2,FALSE);

   gtk_window_set_title (GTK_WINDOW(sub_win2),   "Subwindow 2");

   gtk_window_set_policy (GTK_WINDOW(sub_win2),  FALSE, FALSE,  FALSE);

   gtk_window_set_transient_for (GTK_WINDOW(sub_win2), GTK_WINDOW(main_win));

   gtk_widget_set_app_paintable(sub_win2,TRUE);

/*========================================================================*/

   gtk_widget_show(main_win);

   gtk_widget_show(sub_win1);

   gtk_widget_show(sub_win2);

/*========================== Draw line into a subwindow ==========================*/

   context= gdk_gc_new(sub_win1->window);

   gdk_gc_set_line_attributes(context, 2, GDK_LINE_SOLID, GDK_CAP_BUTT, GDK_JOIN_MITER);

   gdk_draw_line (sub_win1->window,
                                                     kontext,
                                          50,50,100,100);

   update_rect.x=0;
   update_rect.y=0;
   update_rect.width= sub_win1->allocation.width;
   update_rect.width= sub_win1->allocation.width;

   gtk_widget_draw (sub_win1, &update_rect);

/* ======================================================================== */
   gtk_main();

   return 0;
}