gtk2/examples/rulers/rulers.c

#include <gtk/gtk.h>

#define EVENT_METHOD(i, x) GTK_WIDGET_GET_CLASS(i)->x

#define XSIZE  600
#define YSIZE  400

/* This routine gets control when the close button is clicked */
gint close_application( GtkWidget *widget,
                        GdkEvent  *event,
                        gpointer   data )
{
    gtk_main_quit();
    return FALSE;
}

/* The main routine */
int main( int   argc,
          char *argv[] ) {
    GtkWidget *window, *table, *area, *hrule, *vrule;

    /* Initialize GTK and create the main window */
    gtk_init( &argc, &argv );

    window = gtk_window_new( GTK_WINDOW_TOPLEVEL );
    g_signal_connect (GTK_OBJECT (window), "delete_event",
            GTK_SIGNAL_FUNC( close_application ), NULL);
    gtk_container_set_border_width (GTK_CONTAINER (window), 10);

    /* Create a table for placing the ruler and the drawing area */
    table = gtk_table_new( 3, 2, FALSE );
    gtk_container_add( GTK_CONTAINER(window), table );

    area = gtk_drawing_area_new();
    gtk_widget_set_size_request (GTK_WIDGET (area), XSIZE, YSIZE);
    gtk_table_attach( GTK_TABLE(table), area, 1, 2, 1, 2,
                      GTK_EXPAND|GTK_FILL, GTK_FILL, 0, 0 );
    gtk_widget_set_events( area, GDK_POINTER_MOTION_MASK |
                                 GDK_POINTER_MOTION_HINT_MASK );

    /* The horizontal ruler goes on top. As the mouse moves across the
     * drawing area, a motion_notify_event is passed to the
     * appropriate event handler for the ruler. */
    hrule = gtk_hruler_new();
    gtk_ruler_set_metric( GTK_RULER(hrule), GTK_PIXELS );
    gtk_ruler_set_range( GTK_RULER(hrule), 7, 13, 0, 20 );
    g_signal_connect_swapped( GTK_OBJECT(area), "motion_notify_event",
                               (GtkSignalFunc)EVENT_METHOD(hrule,
                                                        motion_notify_event),
                               GTK_OBJECT(hrule) );
    gtk_table_attach( GTK_TABLE(table), hrule, 1, 2, 0, 1,
                      GTK_EXPAND|GTK_SHRINK|GTK_FILL, GTK_FILL, 0, 0 );
    
    /* The vertical ruler goes on the left. As the mouse moves across
     * the drawing area, a motion_notify_event is passed to the
     * appropriate event handler for the ruler. */
    vrule = gtk_vruler_new();
    gtk_ruler_set_metric( GTK_RULER(vrule), GTK_PIXELS );
    gtk_ruler_set_range( GTK_RULER(vrule), 0, YSIZE, 10, YSIZE );
    g_signal_connect_swapped( GTK_OBJECT(area), "motion_notify_event",
                               (GtkSignalFunc)EVENT_METHOD(vrule,
	                                        motion_notify_event),
                               GTK_OBJECT(vrule) );
    gtk_table_attach( GTK_TABLE(table), vrule, 0, 1, 1, 2,
                      GTK_FILL, GTK_EXPAND|GTK_SHRINK|GTK_FILL, 0, 0 );

    /* Now show everything */
    gtk_widget_show( area );
    gtk_widget_show( hrule );
    gtk_widget_show( vrule );
    gtk_widget_show( table );
    gtk_widget_show( window );
    gtk_main();

    return 0;
}