GtkScale a base class for #GtkHScale and #GtkVScale. A #GtkScale is a slider control used to select a numeric value. To use it, you'll probably want to investigate the methods on its base class, #GtkRange, in addition to the methods for #GtkScale itself. To set the value of a scale, you would normally use gtk_range_set_value(). To detect changes to the value, you would normally use the "value_changed" signal. The #GtkScale widget is an abstract class, used only for deriving the subclasses #GtkHScale and #GtkVScale. To create a scale widget, call gtk_hscale_new_with_range() or gtk_vscale_new_with_range(). The #GtkScale-struct struct contains the following fields. (These fields should be considered read-only. They should never be set by an application.) #guint draw_value; non-zero if the scale's current value is displayed next to the slider. #guint value_pos; the position in which the textual value is displayed, selected from #GtkPositionType. Sets the number of decimal places that are displayed in the value. Also causes the value of the adjustment to be rounded off to this number of digits, so the retrieved value matches the value the user saw. @scale: a #GtkScale. @digits: the number of decimal places to display, e.g. use 1 to display 1.0, 2 to display 1.00 etc. Specifies whether the current value is displayed as a string next to the slider. @scale: a #GtkScale. @draw_value: Sets the position in which the current value is displayed. @scale: a #GtkScale. @pos: the position in which the current value is displayed. Signal which allows you to change how the scale value is displayed. Connect a signal handler which returns an allocated string representing @value. That string will then be used to display the scale's value. Here's an example signal handler which displays a value 1.0 as with "-->1.0<--". static gchar* format_value_callback (GtkScale *scale, gdouble value) { return g_strdup_printf ("-->%0.*g<--", gtk_scale_get_digits (scale), value); } @scale: the object which received the signal. @arg1: @Returns: allocated string representing @value @value: value to format The number of decimal places that are displayed in the value. If the current value is displayed as a string next to the slider. The position in which the current value is displayed.