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gtk2/examples/rangewidgets/rangewidgets.c
BST 1998 Tony Gale e8e7692534 - Tidy up of the menufactory example from Andy Kahn <kahn@zk3.dec.com> - 
Thu Aug 13 09:11:11 BST 1998  Tony Gale  <gale@gtk.org>

        * docs/gtk_tut.sgml:
          - Tidy up of the menufactory example from
            Andy Kahn <kahn@zk3.dec.com>
          - New section on Range Widgets from
            David Huggins-Daines <bn711@freenet.carleton.ca>
          - Started a new section on 'Advanced Event and Signal
            Handling' - used an email from Owen.
          - New appendix on Gdk Event Types
          - Added the tictactoe full example code to the
            'Code Examples' appendix
1998-08-13 13:11:14 +00:00

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/* example-start rangewidgets rangewidgets.c */
#include <gtk/gtk.h>
GtkWidget *hscale, *vscale;
void cb_pos_menu_select (GtkWidget *item, GtkPositionType pos)
{
/* set the value position on both scale widgets */
gtk_scale_set_value_pos (GTK_SCALE (hscale), pos);
gtk_scale_set_value_pos (GTK_SCALE (vscale), pos);
}
void cb_update_menu_select (GtkWidget *item, GtkUpdateType policy)
{
/* set the update policy for both scale widgets */
gtk_range_set_update_policy (GTK_RANGE (hscale), policy);
gtk_range_set_update_policy (GTK_RANGE (vscale), policy);
}
void cb_digits_scale (GtkAdjustment *adj)
{
/* set the number of decimal places to which adj->vaule is rounded
*/
gtk_scale_set_digits (GTK_SCALE (hscale), (gint) adj->value);
gtk_scale_set_digits (GTK_SCALE (vscale), (gint) adj->value);
}
void cb_page_size (GtkAdjustment *get, GtkAdjustment *set)
{
/* set the page size and page increment size of the sample
adjustment to the value specified by the "Page Size" scale */
set->page_size = get->value;
set->page_increment = get->value;
/* now emit the "changed" signal to reconfigure all the widgets that
are attached to this adjustment */
gtk_signal_emit_by_name (GTK_OBJECT (set), "changed");
}
void cb_draw_value (GtkToggleButton *button)
{
/* turn the value display on the scale widgets off or on depending
on the state of the checkbutton */
gtk_scale_set_draw_value (GTK_SCALE (hscale), button->active);
gtk_scale_set_draw_value (GTK_SCALE (vscale), button->active);
}
/* convenience functions */
GtkWidget *make_menu_item (gchar *name, GtkSignalFunc callback,
gpointer data)
{
GtkWidget *item;
item = gtk_menu_item_new_with_label (name);
gtk_signal_connect (GTK_OBJECT (item), "activate",
callback, data);
gtk_widget_show (item);
return item;
}
void scale_set_default_values (GtkScale *scale)
{
gtk_range_set_update_policy (GTK_RANGE (scale),
GTK_UPDATE_CONTINUOUS);
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_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_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_state (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_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_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_border_width (GTK_CONTAINER (box2), 10);
/* a GtkHScale 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_border_width (GTK_CONTAINER (box2), 10);
/* And, one last GtkHScale 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_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 */
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