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GtkSpinButton

GtkSpinButton — Retrieve an integer or floating-point number from the user

Synopsis


#include <gtk/gtk.h>


            GtkSpinButton;
enum        GtkSpinButtonUpdatePolicy;
enum        GtkSpinType;
void        gtk_spin_button_configure       (GtkSpinButton *spin_button,
                                             GtkAdjustment *adjustment,
                                             gdouble climb_rate,
                                             guint digits);
GtkWidget*  gtk_spin_button_new             (GtkAdjustment *adjustment,
                                             gdouble climb_rate,
                                             guint digits);
GtkWidget*  gtk_spin_button_new_with_range  (gdouble min,
                                             gdouble max,
                                             gdouble step);
void        gtk_spin_button_set_adjustment  (GtkSpinButton *spin_button,
                                             GtkAdjustment *adjustment);
GtkAdjustment* gtk_spin_button_get_adjustment
                                            (GtkSpinButton *spin_button);
void        gtk_spin_button_set_digits      (GtkSpinButton *spin_button,
                                             guint digits);
void        gtk_spin_button_set_increments  (GtkSpinButton *spin_button,
                                             gdouble step,
                                             gdouble page);
void        gtk_spin_button_set_range       (GtkSpinButton *spin_button,
                                             gdouble min,
                                             gdouble max);
#define     gtk_spin_button_get_value_as_float
gint        gtk_spin_button_get_value_as_int
                                            (GtkSpinButton *spin_button);
void        gtk_spin_button_set_value       (GtkSpinButton *spin_button,
                                             gdouble value);
void        gtk_spin_button_set_update_policy
                                            (GtkSpinButton *spin_button,
                                             GtkSpinButtonUpdatePolicy policy);
void        gtk_spin_button_set_numeric     (GtkSpinButton *spin_button,
                                             gboolean numeric);
void        gtk_spin_button_spin            (GtkSpinButton *spin_button,
                                             GtkSpinType direction,
                                             gdouble increment);
void        gtk_spin_button_set_wrap        (GtkSpinButton *spin_button,
                                             gboolean wrap);
void        gtk_spin_button_set_snap_to_ticks
                                            (GtkSpinButton *spin_button,
                                             gboolean snap_to_ticks);
void        gtk_spin_button_update          (GtkSpinButton *spin_button);
guint       gtk_spin_button_get_digits      (GtkSpinButton *spin_button);
void        gtk_spin_button_get_increments  (GtkSpinButton *spin_button,
                                             gdouble *step,
                                             gdouble *page);
gboolean    gtk_spin_button_get_numeric     (GtkSpinButton *spin_button);
void        gtk_spin_button_get_range       (GtkSpinButton *spin_button,
                                             gdouble *min,
                                             gdouble *max);
gboolean    gtk_spin_button_get_snap_to_ticks
                                            (GtkSpinButton *spin_button);
GtkSpinButtonUpdatePolicy gtk_spin_button_get_update_policy
                                            (GtkSpinButton *spin_button);
gdouble     gtk_spin_button_get_value       (GtkSpinButton *spin_button);
gboolean    gtk_spin_button_get_wrap        (GtkSpinButton *spin_button);
#define     GTK_INPUT_ERROR


Object Hierarchy


  GObject
   +----GtkObject
         +----GtkWidget
               +----GtkEntry
                     +----GtkSpinButton

Implemented Interfaces

GtkSpinButton implements AtkImplementorIface, GtkCellEditable and GtkEditable.

Properties


  "adjustment"           GtkAdjustment         : Read / Write
  "climb-rate"           gdouble               : Read / Write
  "digits"               guint                 : Read / Write
  "numeric"              gboolean              : Read / Write
  "snap-to-ticks"        gboolean              : Read / Write
  "update-policy"        GtkSpinButtonUpdatePolicy  : Read / Write
  "value"                gdouble               : Read / Write
  "wrap"                 gboolean              : Read / Write

Style Properties


  "shadow-type"          GtkShadowType         : Read

Signal Prototypes


"change-value"
            void        user_function      (GtkSpinButton *spinbutton,
                                            GtkScrollType arg1,
                                            gpointer user_data);
"input"     gint        user_function      (GtkSpinButton *spinbutton,
                                            gpointer arg1,
                                            gpointer user_data);
"output"    gboolean    user_function      (GtkSpinButton *spinbutton,
                                            gpointer user_data);
"value-changed"
            void        user_function      (GtkSpinButton *spinbutton,
                                            gpointer user_data);

Description

A GtkSpinButton is an ideal way to allow the user to set the value of some attribute. Rather than having to directly type a number into a GtkEntry, GtkSpinButton allows the user to click on one of two arrows to increment or decrement the displayed value. A value can still be typed in, with the bonus that it can be checked to ensure it is in a given range.

The main properties of a GtkSpinButton are through a GtkAdjustment. See the GtkAdjustment section for more details about an adjustment's properties.

Example 1. Using a GtkSpinButton to get an integer.


/* Provides a function to retrieve an integer value from a GtkSpinButton
 * and creates a spin button to model percentage values.
 */

gint grab_int_value (GtkSpinButton *a_spinner, gpointer user_data) {
   return gtk_spin_button_get_value_as_int (a_spinner);
}

void create_integer_spin_button (void) {

   GtkWidget *window, *spinner;
   GtkAdjustment *spinner_adj;

   spinner_adj = (GtkAdjustment *) gtk_adjustment_new (50.0, 0.0, 100.0, 1.0, 5.0, 5.0);
   
   window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
   gtk_container_set_border_width (GTK_CONTAINER (window), 5);
   
   /* creates the spinner, with no decimal places */
   spinner = gtk_spin_button_new (spinner_adj, 1.0, 0);
   gtk_container_add (GTK_CONTAINER (window), spinner);
   
   gtk_widget_show_all (window);
   return;
}

Example 2. Using a GtkSpinButton to get a floating point value.


/* Provides a function to retrieve a floating point value from a
 * GtkSpinButton, and creates a high precision spin button.
 */

gfloat grab_int_value (GtkSpinButton *a_spinner, gpointer user_data) {
   return gtk_spin_button_get_value (a_spinner);
}

void create_floating_spin_button (void) {

   GtkWidget *window, *spinner;
   GtkAdjustment *spinner_adj;

   spinner_adj = (GtkAdjustment *) gtk_adjustment_new (2.500, 0.0, 5.0, 0.001, 0.1, 0.1);
   
   window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
   gtk_container_set_border_width (GTK_CONTAINER (window), 5);
   
   /* creates the spinner, with three decimal places */
   spinner = gtk_spin_button_new (spinner_adj, 0.001, 3);
   gtk_container_add (GTK_CONTAINER (window), spinner);
   
   gtk_widget_show_all (window);
   return;
}

Details

GtkSpinButton

typedef struct _GtkSpinButton GtkSpinButton;

entry is the GtkEntry part of the GtkSpinButton widget, and can be used accordingly. All other fields contain private data and should only be modified using the functions below.


enum GtkSpinButtonUpdatePolicy

typedef enum
{
  GTK_UPDATE_ALWAYS,
  GTK_UPDATE_IF_VALID
} GtkSpinButtonUpdatePolicy;

GTK_UPDATE_ALWAYSWhen refreshing your GtkSpinButton, the value is always displayed.
GTK_UPDATE_IF_VALIDWhen refreshing your GtkSpinButton, the value is only displayed if it is valid within the bounds of the spin button's GtkAdjustment.


enum GtkSpinType

typedef enum
{
  GTK_SPIN_STEP_FORWARD,
  GTK_SPIN_STEP_BACKWARD,
  GTK_SPIN_PAGE_FORWARD,
  GTK_SPIN_PAGE_BACKWARD,
  GTK_SPIN_HOME,
  GTK_SPIN_END,
  GTK_SPIN_USER_DEFINED
} GtkSpinType;

GTK_SPIN_STEP_FORWARD, GTK_SPIN_STEP_BACKWARD, GTK_SPIN_PAGE_FORWARD, GTK_SPIN_PAGE_BACKWARDThese values spin a GtkSpinButton by the relevant values of the spin button's GtkAdjustment.
GTK_SPIN_HOME, GTK_SPIN_ENDThese set the spin button's value to the minimum or maxmimum possible values, (set by its GtkAdjustment), respectively.
GTK_SPIN_USER_DEFINEDThe programmer must specify the exact amount to spin the GtkSpinButton.


gtk_spin_button_configure ()

void        gtk_spin_button_configure       (GtkSpinButton *spin_button,
                                             GtkAdjustment *adjustment,
                                             gdouble climb_rate,
                                             guint digits);

Changes the properties of an existing spin button. The adjustment, climb rate, and number of decimal places are all changed accordingly, after this function call.

spin_button :a GtkSpinButton.
adjustment :a GtkAdjustment.
climb_rate :the new climb rate.
digits :the number of decimal places to display in the spin button.

gtk_spin_button_new ()

GtkWidget*  gtk_spin_button_new             (GtkAdjustment *adjustment,
                                             gdouble climb_rate,
                                             guint digits);

Creates a new GtkSpinButton.

adjustment :the GtkAdjustment object that this spin button should use.
climb_rate :specifies how much the spin button changes when an arrow is clicked on.
digits :the number of decimal places to display.
Returns :The new spin button as a GtkWidget.

gtk_spin_button_new_with_range ()

GtkWidget*  gtk_spin_button_new_with_range  (gdouble min,
                                             gdouble max,
                                             gdouble step);

This is a convenience constructor that allows creation of a numeric GtkSpinButton without manually creating an adjustment. The value is initially set to the minimum value and a page increment of 10 * step is the default. The precision of the spin button is equivalent to the precision of step.

min : Minimum allowable value
max : Maximum allowable value
step : Increment added or subtracted by spinning the widget
Returns : The new spin button as a GtkWidget.

gtk_spin_button_set_adjustment ()

void        gtk_spin_button_set_adjustment  (GtkSpinButton *spin_button,
                                             GtkAdjustment *adjustment);

Replaces the GtkAdjustment associated with spin_button.

spin_button : a GtkSpinButton
adjustment : a GtkAdjustment to replace the existing adjustment

gtk_spin_button_get_adjustment ()

GtkAdjustment* gtk_spin_button_get_adjustment
                                            (GtkSpinButton *spin_button);

Get the adjustment associated with a GtkSpinButton

spin_button :
Returns : the GtkAdjustment of spin_button

gtk_spin_button_set_digits ()

void        gtk_spin_button_set_digits      (GtkSpinButton *spin_button,
                                             guint digits);

Set the precision to be displayed by spin_button. Up to 20 digit precision is allowed.

spin_button : a GtkSpinButton
digits : the number of digits after the decimal point to be displayed for the spin button's value

gtk_spin_button_set_increments ()

void        gtk_spin_button_set_increments  (GtkSpinButton *spin_button,
                                             gdouble step,
                                             gdouble page);

Sets the step and page increments for spin_button. This affects how quickly the value changes when the spin button's arrows are activated.

spin_button : a GtkSpinButton
step : increment applied for a button 1 press.
page : increment applied for a button 2 press.

gtk_spin_button_set_range ()

void        gtk_spin_button_set_range       (GtkSpinButton *spin_button,
                                             gdouble min,
                                             gdouble max);

Sets the minimum and maximum allowable values for spin_button

spin_button : a GtkSpinButton
min : minimum allowable value
max : maximum allowable value

gtk_spin_button_get_value_as_float

#define gtk_spin_button_get_value_as_float gtk_spin_button_get_value

Warning

gtk_spin_button_get_value_as_float is deprecated and should not be used in newly-written code.

Gets the value in the spin_button. This function is deprecated, use gtk_spin_button_get_value() instead.

Returns :the value of spin_button.

gtk_spin_button_get_value_as_int ()

gint        gtk_spin_button_get_value_as_int
                                            (GtkSpinButton *spin_button);

Get the value spin_button represented as an integer.

spin_button : a GtkSpinButton
Returns : the value of spin_button

gtk_spin_button_set_value ()

void        gtk_spin_button_set_value       (GtkSpinButton *spin_button,
                                             gdouble value);

Set the value of spin_button.

spin_button : a GtkSpinButton
value : the new value

gtk_spin_button_set_update_policy ()

void        gtk_spin_button_set_update_policy
                                            (GtkSpinButton *spin_button,
                                             GtkSpinButtonUpdatePolicy policy);

Sets the update behavior of a spin button. This determines whether the spin button is always updated or only when a valid value is set.

spin_button : a GtkSpinButton
policy : a GtkSpinButtonUpdatePolicy value

gtk_spin_button_set_numeric ()

void        gtk_spin_button_set_numeric     (GtkSpinButton *spin_button,
                                             gboolean numeric);

Sets the flag that determines if non-numeric text can be typed into the spin button.

spin_button : a GtkSpinButton
numeric : flag indicating if only numeric entry is allowed.

gtk_spin_button_spin ()

void        gtk_spin_button_spin            (GtkSpinButton *spin_button,
                                             GtkSpinType direction,
                                             gdouble increment);

Increment or decrement a spin button's value in a specified direction by a specified amount.

spin_button : a GtkSpinButton
direction : a GtkSpinType indicating the direction to spin.
increment : step increment to apply in the specified direction.

gtk_spin_button_set_wrap ()

void        gtk_spin_button_set_wrap        (GtkSpinButton *spin_button,
                                             gboolean wrap);

Sets the flag that determines if a spin button value wraps around to the opposite limit when the upper or lower limit of the range is exceeded.

spin_button : a GtkSpinButton
wrap : a flag indicating if wrapping behavior is performed.

gtk_spin_button_set_snap_to_ticks ()

void        gtk_spin_button_set_snap_to_ticks
                                            (GtkSpinButton *spin_button,
                                             gboolean snap_to_ticks);

Sets the policy as to whether values are corrected to the nearest step increment when a spin button is activated after providing an invalid value.

spin_button : a GtkSpinButton
snap_to_ticks : a flag indicating if invalid values should be corrected.

gtk_spin_button_update ()

void        gtk_spin_button_update          (GtkSpinButton *spin_button);

Manually force an update of the spin button.

spin_button : a GtkSpinButton

gtk_spin_button_get_digits ()

guint       gtk_spin_button_get_digits      (GtkSpinButton *spin_button);

Fetches the precision of spin_button. See gtk_spin_button_set_digits().

spin_button : a GtkSpinButton
Returns : the current precision

gtk_spin_button_get_increments ()

void        gtk_spin_button_get_increments  (GtkSpinButton *spin_button,
                                             gdouble *step,
                                             gdouble *page);

Gets the current step and page the increments used by spin_button. See gtk_spin_button_set_increments().

spin_button : a GtkSpinButton
step : location to store step increment, or NULL
page : location to store page increment, or NULL

gtk_spin_button_get_numeric ()

gboolean    gtk_spin_button_get_numeric     (GtkSpinButton *spin_button);

Returns whether non-numeric text can be typed into the spin button. See gtk_spin_button_set_numeric().

spin_button : a GtkSpinButton
Returns : TRUE if only numeric text can be entered

gtk_spin_button_get_range ()

void        gtk_spin_button_get_range       (GtkSpinButton *spin_button,
                                             gdouble *min,
                                             gdouble *max);

Gets the range allowed for spin_button. See gtk_spin_button_set_range().

spin_button : a GtkSpinButton
min : location to store minimum allowed value, or NULL
max : location to store maximum allowed value, or NULL

gtk_spin_button_get_snap_to_ticks ()

gboolean    gtk_spin_button_get_snap_to_ticks
                                            (GtkSpinButton *spin_button);

Returns whether the values are corrected to the nearest step. See gtk_spin_button_set_snap_to_ticks().

spin_button : a GtkSpinButton
Returns : TRUE if values are snapped to the nearest step.

gtk_spin_button_get_update_policy ()

GtkSpinButtonUpdatePolicy gtk_spin_button_get_update_policy
                                            (GtkSpinButton *spin_button);

Gets the update behavior of a spin button. See gtk_spin_button_set_update_policy().

spin_button : a GtkSpinButton
Returns : the current update policy

gtk_spin_button_get_value ()

gdouble     gtk_spin_button_get_value       (GtkSpinButton *spin_button);

Get the value in the spin_button.

spin_button : a GtkSpinButton
Returns : the value of spin_button

gtk_spin_button_get_wrap ()

gboolean    gtk_spin_button_get_wrap        (GtkSpinButton *spin_button);

Returns whether the spin button's value wraps around to the opposite limit when the upper or lower limit of the range is exceeded. See gtk_spin_button_set_wrap().

spin_button : a GtkSpinButton
Returns : TRUE if the spin button wraps around

GTK_INPUT_ERROR

#define GTK_INPUT_ERROR -1

Properties

The "adjustment" property

  "adjustment"           GtkAdjustment         : Read / Write

The adjustment that holds the value of the spinbutton.


The "climb-rate" property

  "climb-rate"           gdouble               : Read / Write

The acceleration rate when you hold down a button.

Allowed values: >= 0

Default value: 0


The "digits" property

  "digits"               guint                 : Read / Write

The number of decimal places to display.

Allowed values: <= 20

Default value: 0


The "numeric" property

  "numeric"              gboolean              : Read / Write

Whether non-numeric characters should be ignored.

Default value: FALSE


The "snap-to-ticks" property

  "snap-to-ticks"        gboolean              : Read / Write

Whether erroneous values are automatically changed to a spin button's nearest step increment.

Default value: FALSE


The "update-policy" property

  "update-policy"        GtkSpinButtonUpdatePolicy  : Read / Write

Whether the spin button should update always, or only when the value is legal.

Default value: GTK_UPDATE_ALWAYS


The "value" property

  "value"                gdouble               : Read / Write

Reads the current value, or sets a new value.

Default value: 0


The "wrap" property

  "wrap"                 gboolean              : Read / Write

Whether a spin button should wrap upon reaching its limits.

Default value: FALSE

Style Properties

The "shadow-type" style property

  "shadow-type"          GtkShadowType         : Read

the type of border that surrounds the arrows of a spin button.

Default value: GTK_SHADOW_IN

Signals

The "change-value" signal

void        user_function                  (GtkSpinButton *spinbutton,
                                            GtkScrollType arg1,
                                            gpointer user_data);

spinbutton :the object which received the signal.
arg1 :
user_data :user data set when the signal handler was connected.

The "input" signal

gint        user_function                  (GtkSpinButton *spinbutton,
                                            gpointer arg1,
                                            gpointer user_data);

spinbutton :the object which received the signal.
arg1 :
user_data :user data set when the signal handler was connected.
Returns :

The "output" signal

gboolean    user_function                  (GtkSpinButton *spinbutton,
                                            gpointer user_data);

spinbutton :the object which received the signal.
user_data :user data set when the signal handler was connected.
Returns :

The "value-changed" signal

void        user_function                  (GtkSpinButton *spinbutton,
                                            gpointer user_data);

spinbutton :the object which received the signal.
user_data :user data set when the signal handler was connected.

See Also

GtkEntry

retrieve text rather than numbers.