sec-rangewidgetsexample.html

gtk 开发手册和参考文档。 包括gtk glib gdk等

    gtk_scale_set_digits (scale, 1);
    gtk_scale_set_value_pos (scale, GTK_POS_TOP);
    gtk_scale_set_draw_value (scale, TRUE);
}

/* makes the sample window */

void create_range_controls( void )
{
    GtkWidget *window;
    GtkWidget *box1, *box2, *box3;
    GtkWidget *button;
    GtkWidget *scrollbar;
    GtkWidget *separator;
    GtkWidget *opt, *menu, *item;
    GtkWidget *label;
    GtkWidget *scale;
    GtkObject *adj1, *adj2;

    /* Standard window-creating stuff */
    window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
    gtk_signal_connect (GTK_OBJECT (window), "destroy",
                        GTK_SIGNAL_FUNC(gtk_main_quit),
                        NULL);
    gtk_window_set_title (GTK_WINDOW (window), "range controls");

    box1 = gtk_vbox_new (FALSE, 0);
    gtk_container_add (GTK_CONTAINER (window), box1);
    gtk_widget_show (box1);

    box2 = gtk_hbox_new (FALSE, 10);
    gtk_container_set_border_width (GTK_CONTAINER (box2), 10);
    gtk_box_pack_start (GTK_BOX (box1), box2, TRUE, TRUE, 0);
    gtk_widget_show (box2);

    /* value, lower, upper, step_increment, page_increment, page_size */
    /* Note that the page_size value only makes a difference for
     * scrollbar widgets, and the highest value you'll get is actually
     * (upper - page_size). */
    adj1 = gtk_adjustment_new (0.0, 0.0, 101.0, 0.1, 1.0, 1.0);
  
    vscale = gtk_vscale_new (GTK_ADJUSTMENT (adj1));
    scale_set_default_values (GTK_SCALE (vscale));
    gtk_box_pack_start (GTK_BOX (box2), vscale, TRUE, TRUE, 0);
    gtk_widget_show (vscale);

    box3 = gtk_vbox_new (FALSE, 10);
    gtk_box_pack_start (GTK_BOX (box2), box3, TRUE, TRUE, 0);
    gtk_widget_show (box3);

    /* Reuse the same adjustment */
    hscale = gtk_hscale_new (GTK_ADJUSTMENT (adj1));
    gtk_widget_set_usize (GTK_WIDGET (hscale), 200, 30);
    scale_set_default_values (GTK_SCALE (hscale));
    gtk_box_pack_start (GTK_BOX (box3), hscale, TRUE, TRUE, 0);
    gtk_widget_show (hscale);

    /* Reuse the same adjustment again */
    scrollbar = gtk_hscrollbar_new (GTK_ADJUSTMENT (adj1));
    /* Notice how this causes the scales to always be updated
     * continuously when the scrollbar is moved */
    gtk_range_set_update_policy (GTK_RANGE (scrollbar), 
                                 GTK_UPDATE_CONTINUOUS);
    gtk_box_pack_start (GTK_BOX (box3), scrollbar, TRUE, TRUE, 0);
    gtk_widget_show (scrollbar);

    box2 = gtk_hbox_new (FALSE, 10);
    gtk_container_set_border_width (GTK_CONTAINER (box2), 10);
    gtk_box_pack_start (GTK_BOX (box1), box2, TRUE, TRUE, 0);
    gtk_widget_show (box2);

    /* A checkbutton to control whether the value is displayed or not */
    button = gtk_check_button_new_with_label("Display value on scale widgets");
    gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (button), TRUE);
    gtk_signal_connect (GTK_OBJECT (button), "toggled",
                        GTK_SIGNAL_FUNC(cb_draw_value), NULL);
    gtk_box_pack_start (GTK_BOX (box2), button, TRUE, TRUE, 0);
    gtk_widget_show (button);
  
    box2 = gtk_hbox_new (FALSE, 10);
    gtk_container_set_border_width (GTK_CONTAINER (box2), 10);

    /* An option menu to change the position of the value */
    label = gtk_label_new ("Scale Value Position:");
    gtk_box_pack_start (GTK_BOX (box2), label, FALSE, FALSE, 0);
    gtk_widget_show (label);
  
    opt = gtk_option_menu_new();
    menu = gtk_menu_new();

    item = make_menu_item ("Top",
                           GTK_SIGNAL_FUNC(cb_pos_menu_select),
                           GINT_TO_POINTER (GTK_POS_TOP));
    gtk_menu_append (GTK_MENU (menu), item);
  
    item = make_menu_item ("Bottom", GTK_SIGNAL_FUNC (cb_pos_menu_select), 
                           GINT_TO_POINTER (GTK_POS_BOTTOM));
    gtk_menu_append (GTK_MENU (menu), item);
  
    item = make_menu_item ("Left", GTK_SIGNAL_FUNC (cb_pos_menu_select),
                           GINT_TO_POINTER (GTK_POS_LEFT));
    gtk_menu_append (GTK_MENU (menu), item);
  
    item = make_menu_item ("Right", GTK_SIGNAL_FUNC (cb_pos_menu_select),
                            GINT_TO_POINTER (GTK_POS_RIGHT));
    gtk_menu_append (GTK_MENU (menu), item);
  
    gtk_option_menu_set_menu (GTK_OPTION_MENU (opt), menu);
    gtk_box_pack_start (GTK_BOX (box2), opt, TRUE, TRUE, 0);
    gtk_widget_show (opt);

    gtk_box_pack_start (GTK_BOX (box1), box2, TRUE, TRUE, 0);
    gtk_widget_show (box2);

    box2 = gtk_hbox_new (FALSE, 10);
    gtk_container_set_border_width (GTK_CONTAINER (box2), 10);

    /* Yet another option menu, this time for the update policy of the
     * scale widgets */
    label = gtk_label_new ("Scale Update Policy:");
    gtk_box_pack_start (GTK_BOX (box2), label, FALSE, FALSE, 0);
    gtk_widget_show (label);
  
    opt = gtk_option_menu_new();
    menu = gtk_menu_new();
  
    item = make_menu_item ("Continuous",
                           GTK_SIGNAL_FUNC (cb_update_menu_select),
                           GINT_TO_POINTER (GTK_UPDATE_CONTINUOUS));
    gtk_menu_append (GTK_MENU (menu), item);
  
    item = make_menu_item ("Discontinuous",
                            GTK_SIGNAL_FUNC (cb_update_menu_select),
                            GINT_TO_POINTER (GTK_UPDATE_DISCONTINUOUS));
    gtk_menu_append (GTK_MENU (menu), item);
  
    item = make_menu_item ("Delayed",
                           GTK_SIGNAL_FUNC (cb_update_menu_select),
                           GINT_TO_POINTER (GTK_UPDATE_DELAYED));
    gtk_menu_append (GTK_MENU (menu), item);
  
    gtk_option_menu_set_menu (GTK_OPTION_MENU (opt), menu);
    gtk_box_pack_start (GTK_BOX (box2), opt, TRUE, TRUE, 0);
    gtk_widget_show (opt);
  
    gtk_box_pack_start (GTK_BOX (box1), box2, TRUE, TRUE, 0);
    gtk_widget_show (box2);

    box2 = gtk_hbox_new (FALSE, 10);
    gtk_container_set_border_width (GTK_CONTAINER (box2), 10);
  
    /* An HScale widget for adjusting the number of digits on the
     * sample scales. */
    label = gtk_label_new ("Scale Digits:");
    gtk_box_pack_start (GTK_BOX (box2), label, FALSE, FALSE, 0);
    gtk_widget_show (label);

    adj2 = gtk_adjustment_new (1.0, 0.0, 5.0, 1.0, 1.0, 0.0);
    gtk_signal_connect (GTK_OBJECT (adj2), "value_changed",
                        GTK_SIGNAL_FUNC (cb_digits_scale), NULL);
    scale = gtk_hscale_new (GTK_ADJUSTMENT (adj2));
    gtk_scale_set_digits (GTK_SCALE (scale), 0);
    gtk_box_pack_start (GTK_BOX (box2), scale, TRUE, TRUE, 0);
    gtk_widget_show (scale);

    gtk_box_pack_start (GTK_BOX (box1), box2, TRUE, TRUE, 0);
    gtk_widget_show (box2);
  
    box2 = gtk_hbox_new (FALSE, 10);
    gtk_container_set_border_width (GTK_CONTAINER (box2), 10);
  
    /* And, one last HScale widget for adjusting the page size of the
     * scrollbar. */
    label = gtk_label_new ("Scrollbar Page Size:");
    gtk_box_pack_start (GTK_BOX (box2), label, FALSE, FALSE, 0);
    gtk_widget_show (label);

    adj2 = gtk_adjustment_new (1.0, 1.0, 101.0, 1.0, 1.0, 0.0);
    gtk_signal_connect (GTK_OBJECT (adj2), "value_changed",
                        GTK_SIGNAL_FUNC (cb_page_size), adj1);
    scale = gtk_hscale_new (GTK_ADJUSTMENT (adj2));
    gtk_scale_set_digits (GTK_SCALE (scale), 0);
    gtk_box_pack_start (GTK_BOX (box2), scale, TRUE, TRUE, 0);
    gtk_widget_show (scale);

    gtk_box_pack_start (GTK_BOX (box1), box2, TRUE, TRUE, 0);
    gtk_widget_show (box2);

    separator = gtk_hseparator_new ();
    gtk_box_pack_start (GTK_BOX (box1), separator, FALSE, TRUE, 0);
    gtk_widget_show (separator);

    box2 = gtk_vbox_new (FALSE, 10);
    gtk_container_set_border_width (GTK_CONTAINER (box2), 10);
    gtk_box_pack_start (GTK_BOX (box1), box2, FALSE, TRUE, 0);
    gtk_widget_show (box2);

    button = gtk_button_new_with_label ("Quit");
    gtk_signal_connect_object (GTK_OBJECT (button), "clicked",
                               GTK_SIGNAL_FUNC(gtk_main_quit),
                               NULL);
    gtk_box_pack_start (GTK_BOX (box2), button, TRUE, TRUE, 0);
    GTK_WIDGET_SET_FLAGS (button, GTK_CAN_DEFAULT);
    gtk_widget_grab_default (button);
    gtk_widget_show (button);

    gtk_widget_show (window);
}

int main( int   argc,
          char *argv[] )
{
    gtk_init(&argc, &argv);

    create_range_controls();

    gtk_main();

    return(0);
}

/* example-end */</PRE
></TD
></TR
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><P
>You will notice that the program does not call <TT
CLASS="LITERAL"
>gtk_signal_connect</TT
>
for the "delete_event", but only for the "destroy" signal. This will
still perform the desired function, because an unhandled
"delete_event" will result in a "destroy" signal being given to the
window.</P
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