![]() |
![]() |
![]() |
GTK+ Reference Manual | ![]() |
---|---|---|---|---|
#include <gtk/gtk.h> GtkScale; void gtk_scale_set_digits (GtkScale *scale, gint digits); void gtk_scale_set_draw_value (GtkScale *scale, gboolean draw_value); void gtk_scale_set_value_pos (GtkScale *scale, GtkPositionType pos); gint gtk_scale_get_digits (GtkScale *scale); gboolean gtk_scale_get_draw_value (GtkScale *scale); GtkPositionType gtk_scale_get_value_pos (GtkScale *scale); PangoLayout* gtk_scale_get_layout (GtkScale *scale); void gtk_scale_get_layout_offsets (GtkScale *scale, gint *x, gint *y);
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()
.
typedef struct { GtkRange range; gint digits; guint draw_value : 1; guint value_pos : 2; } GtkScale;
The GtkScale 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. |
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.
|
a GtkScale. |
|
the number of decimal places to display, e.g. use 1 to display 1.0, 2 to display 1.00 etc. |
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.
|
a GtkScale. |
|
a boolean. |
void gtk_scale_set_value_pos (GtkScale *scale, GtkPositionType pos);
Sets the position in which the current value is displayed.
|
a GtkScale. |
|
the position in which the current value is displayed. |
gint gtk_scale_get_digits (GtkScale *scale);
Gets the number of decimal places that are displayed in the value.
|
a GtkScale. |
Returns : |
the number of decimal places that are displayed. |
gboolean gtk_scale_get_draw_value (GtkScale *scale);
Returns whether the current value is displayed as a string next to the slider.
|
a GtkScale. |
Returns : |
whether the current value is displayed as a string. |
GtkPositionType gtk_scale_get_value_pos (GtkScale *scale);
Gets the position in which the current value is displayed.
|
a GtkScale. |
Returns : |
the position in which the current value is displayed. |
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.
|
A GtkScale |
Returns : |
the PangoLayout for this scale, or NULL
if the GtkScale:draw-value property is FALSE .
|
Since 2.4
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 GtkScale:draw-value property is FALSE
, the return
values are undefined.
|
a GtkScale |
|
location to store X offset of layout, or NULL
|
|
location to store Y offset of layout, or NULL
|
Since 2.4