GtkScale as GtkBuildable

GtkScale supports a custom <marks> element, which can contain multiple <mark> elements. The "value" and "position" attributes have the same meaning as gtk_scale_add_mark() parameters of the same name. If the element is not empty, its content is taken as the markup to show at the mark. It can be translated with the usual "translatable and "context" attributes.

struct GtkScale

struct GtkScale;

The fields of the GtkScale struct should only be accessed via the accessor functions.

gtk_scale_set_digits ()

void                gtk_scale_set_digits                (GtkScale *scale,
                                                         gint 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 ()

void                gtk_scale_set_draw_value            (GtkScale *scale,
                                                         gboolean draw_value);

Specifies whether the current value is displayed as a string next to the slider.

gtk_scale_set_value_pos ()

void                gtk_scale_set_value_pos             (GtkScale *scale,
                                                         GtkPositionType pos);

Sets the position in which the current value is displayed.

gtk_scale_get_digits ()

gint                gtk_scale_get_digits                (GtkScale *scale);

Gets the number of decimal places that are displayed in the value.

gtk_scale_get_draw_value ()

gboolean            gtk_scale_get_draw_value            (GtkScale *scale);

Returns whether the current value is displayed as a string next to the slider.

gtk_scale_get_value_pos ()

GtkPositionType     gtk_scale_get_value_pos             (GtkScale *scale);

Gets the position in which the current value is displayed.

gtk_scale_get_layout ()

PangoLayout *       gtk_scale_get_layout                (GtkScale *scale);

Gets the PangoLayout used to display the scale. The returned object is owned by the scale so does not need to be freed by the caller.

Since 2.4

gtk_scale_get_layout_offsets ()

void                gtk_scale_get_layout_offsets        (GtkScale *scale,
                                                         gint *x,
                                                         gint *y);

Obtains the coordinates where the scale will draw the PangoLayout representing the text in the scale. Remember when using the PangoLayout function you need to convert to and from pixels using PANGO_PIXELS() or PANGO_SCALE.

If the "draw-value" property is FALSE, the return values are undefined.

Since 2.4

gtk_scale_add_mark ()

void                gtk_scale_add_mark                  (GtkScale *scale,
                                                         gdouble value,
                                                         GtkPositionType position,
                                                         const gchar *markup);

Adds a mark at value.

A mark is indicated visually by drawing a tick mark next to the scale, and GTK+ makes it easy for the user to position the scale exactly at the marks value.

If markup is not NULL, text is shown next to the tick mark.

To remove marks from a scale, use gtk_scale_clear_marks().

Since 2.16

gtk_scale_clear_marks ()

void                gtk_scale_clear_marks               (GtkScale *scale);

Removes any marks that have been added with gtk_scale_add_mark().

Since 2.16

The "digits" property

  "digits"                   gint                  : Read / Write

The number of decimal places that are displayed in the value.

Allowed values: [G_MAXULONG,64]

Default value: 1

The "draw-value" property

  "draw-value"               gboolean              : Read / Write

Whether the current value is displayed as a string next to the slider.

Default value: TRUE

The "value-pos" property

  "value-pos"                GtkPositionType       : Read / Write

The position in which the current value is displayed.

Default value: GTK_POS_TOP

The "slider-length" style property

  "slider-length"            gint                  : Read

Length of scale's slider.

Allowed values: >= 0

Default value: 31

The "value-spacing" style property

  "value-spacing"            gint                  : Read

Space between value text and the slider/trough area.

Allowed values: >= 0

Default value: 2

The "format-value" signal

gchar*              user_function                      (GtkScale *scale,
                                                        gdouble   value,
                                                        gpointer  user_data)      : Run Last

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<--".

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static gchar*
format_value_callback (GtkScale *scale,
                       gdouble   value)
{
  return g_strdup_printf ("-->%0.*g<--",
                          gtk_scale_get_digits (scale), value);
 }