Description
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().
Details
struct GtkScale
The GtkScale struct contains the following fields.
(These fields should be considered read-only. They should never be set by
an application.)
gtk_scale_set_digits ()
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.
gtk_scale_set_draw_value ()
Specifies whether the current value is displayed as a string next to the
slider.
gtk_scale_set_value_pos ()
Sets the position in which the current value is displayed.
Args
- "digits" (gint : Read / Write)
The number of decimal places that are displayed in the value.
- "draw-value" (gboolean : Read / Write)
If the current value is displayed as a string next to the slider.
- "value-pos" (GtkPositionType : Read / Write)
The position in which the current value is displayed.
Signals
The "format-value" signal
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);
} |