listing_8_09.c

This source code has been tested under OpenWindows 2.0, Sun s X11/NeWS server. For Xlib programs th

/***********************************************************************
**                                                                    **
**  listing_8_9.c                                                     **
**                                                                    **
**  "Mouse Tracker". This program demonstrates the use of an event    **
**  handler.                                                          **
**                                                                    **
***********************************************************************/


#include <Xm/Label.h>


void	EvtHandler();			/* FORWARD definition	     */


Widget	appshell,			/* The label and its shell   */
	the_label;


void main( argc, argv )
    int     argc;
    char    *argv[];
{
    appshell = XtInitialize( argv[0], "Listing_8_09", NULL, 0, &argc, argv );

    the_label = XmCreateLabel( appshell, "TheLabel", NULL, 0 );
    XtManageChild( the_label );

    XtAddEventHandler( the_label, 
                       PointerMotionMask | ButtonPressMask |
		       EnterWindowMask | LeaveWindowMask,
		       FALSE, EvtHandler, NULL );

    XtRealizeWidget( appshell );
    XtMainLoop();
}


void EvtHandler( w, client_data, evt_ptr )
    Widget      w;
    caddr_t     client_data;
    XEvent      *evt_ptr;
{
    switch( evt_ptr->type )
        {
	case ButtonPress:
	    printf( "\nButtonPress\n" );
	    printf( "    Time     = %d\n", evt_ptr->xbutton.time );
	    printf( "    x,y      = %d, %d\n", evt_ptr->xbutton.x, 
					       evt_ptr->xbutton.y );
	    printf( "    Button   = %d\n", evt_ptr->xbutton.button );
	    break;
	case EnterNotify:
	    printf( "\nEnterNotify\n" );
	    printf( "    Time     = %d\n", evt_ptr->xcrossing.time );
	    printf( "    x,y      = %d, %d\n", evt_ptr->xcrossing.x, 
					       evt_ptr->xcrossing.y );
	    break;
	case LeaveNotify:
	    printf( "\nLeaveNotify\n" );
	    printf( "    Time     = %d\n", evt_ptr->xcrossing.time );
	    printf( "    x,y      = %d, %d\n", evt_ptr->xcrossing.x, 
					       evt_ptr->xcrossing.y );
	    break;
	case MotionNotify:
	    printf( "\nMotionNotify\n" );
	    printf( "    Time     = %d\n", evt_ptr->xmotion.time );
	    printf( "    x,y      = %d, %d\n", evt_ptr->xmotion.x, 
					       evt_ptr->xmotion.y );
	    break;
	default:
	    break;
        }
}