#define _GNU_SOURCE 
#include <stdlib.h>
#include <stdio.h>
#include <X11/StringDefs.h>
#include <Xaw/Box.h>
#include <Xaw/Label.h>
#include <Xaw/Scrollbar.h>
#include <Xaw/Command.h>

static void
quit_cb(Widget w, XtPointer client_data, XtPointer call_data)
{
        XtAppSetExitFlag(XtWidgetToApplicationContext(w));
}

static void
scroll_cb(Widget widget,XtPointer label_ptr, XtPointer value_ptr)
{
	long value =  (long)value_ptr;
    Widget label = (Widget) label_ptr;
    char *msg=NULL;
    asprintf(&msg, "%ld", value);
    XtVaSetValues( label, XtNlabel, msg,     NULL);
    free(msg);
}
static void
jump_cb(Widget widget,XtPointer label_ptr, XtPointer value_ptr)
{
	float value =  *(float *)value_ptr;
        Widget label = (Widget) label_ptr;
	char *msg=NULL;
	asprintf(&msg, "%lf", value);
	XtVaSetValues( label, XtNlabel, msg,     NULL);
	free(msg);
}	

int main(int argc, char **argv)
{
  Widget toplevel,box,label,scroll,command;
    XtAppContext app_con;
    toplevel = XtAppInitialize(&app_con, "demo", NULL, 0,
                               &argc, argv, NULL,
                               NULL, 0);

    box = XtCreateManagedWidget("box", boxWidgetClass, toplevel, NULL, 0);
 
    label = XtVaCreateManagedWidget("Label",
                                   labelWidgetClass,
				    box, XtNlabel, "hello", NULL);

    command = XtVaCreateManagedWidget("cmd",
				    commandWidgetClass,  box,
				    XtNlabel, "EXIT",
				    NULL);

    XtAddCallback(command, XtNcallback, quit_cb, NULL);

    scroll = XtVaCreateManagedWidget("scroller",
				     scrollbarWidgetClass, box,
				     XtNorientation,XtorientHorizontal,
				     XtNlength,500,
				     XtNwidth,100,
				     NULL);
  
   XtAddCallback(scroll, XtNscrollProc, scroll_cb, label);
   XtAddCallback(scroll,XtNjumpProc,jump_cb,label);

    XtRealizeWidget(toplevel);

    XtAppMainLoop(app_con);
    exit(0);
}